This effect is used in a range of mechanical and electrical devices. together. When a material is heated, The increase in energy causes the atoms and molecules to move more and to take up more space that is, to expand. Metals are chosen that expand at different rates when the Necessary cookies are absolutely essential for the website to function properly. If the strip is cooled, it curves with the steel on the outside. These cookies ensure basic functionalities and security features of the website, anonymously. The strip is connected to a switch and as the temperature changes the strip flexes and opens or closes a contact. Select two metals that expand at very different levels; this disparity is what causes the bimetallic strip to move in the way it does. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. Analytical cookies are used to understand how visitors interact with the website. When the strip is heated beyond the pre-set temperature, it does not remain straight, as one strip bends more than the other, due to unequal thermal expans Continue Reading 1 More answers below Hareesh Nair The width of the gap between the contacts determines the temperature that will set off the alarm. The bimetallic strip consists of two thin strips of different metals, each having different coefficients of thermal expansion. Metals are chosen that expand at different rates when the strips get hot. A bimetallic strip is used to convert a temperature change into mechanical displacement. A good rule of thumb for energy-saving heating is to set your thermostat at 68 F. For more comfort, try increasing the temperature by 1 or 2 degrees at a time. Consider two metals like A and B at two different temperatures T1 and T2. Why does bimetallic strip bend with changes in temperature? A bimetallic strip is formed by bonding two different thin strips of metals usually steel ( 12 * 10-6 K-1) & brass ( 18.7 * 10-6 K-1), or copper ( 16.6 * 10-6 K-1), where one end of these metals are fixed by welding them and other end is left free. 9 What are the coefficients of linear expansion in bimetallic strip? Thermal expansion is the tendency for a material to change its characteristics due to external temperature. Every metallic material in the universe has its own properties like electrical property, mechanical property, magnetic properties, chemical properties, thermal properties, and optical properties. why are concrete sidewalds made in small sections rather than in one long continuous piece? Where was the Dayton peace agreement signed? It does not store any personal data. Solve any question of Thermal Properties Of Matter with:-. The effect is called negative thermal expansion. Thus they bend towards the metal having a lower thermal expansion. The metal with the higher coefficient of thermal expansion is on the outer side of the curve when the strip is heated and on the inner side when cooled. A bimetallic strip can be used as thermometer and thermostat. 2 What happens when a bimetallic strip is heated? 2 How does a fire alarm with a bimetallic strip work? 68 F. For example, for brass and steel, the coefficients of linear expansion are: Brass: 19 x 10-6/C Steel: 11 x 10-6/C When this bimetallic strip is heated, the brass expands more than the steel and the strip curves with the brass on the outside. In a refrigerator, the reverse set-up is used. When this bimetallic strip is heated, the brass expands more than the steel and the strip . Each metal responds to heat and cold by expanding a specific amount based on the change in temperature. How far away should your wheels be from the curb when parallel parking? /1 11. The bimetallic strips are commonly used in thermostats. Each metal responds to heat and cold by expanding a specific amount based on the change in temperature. Bimetals Work with the propensity of metals to expand when heated, and contract when cooled. How does a fire alarm with a bimetallic strip work? When this bimetallic strip is heated, the brass expands more than the steel and the strip curves with the brass on the outside. A bimetallic strip is made of two different kinds of metals that are laminated into one strip. The metal which expands the most will therefore be the one which has the largest coefficient of linear thermal expansion. It is simply two strips of different metals bonded together and held at one end. This means that an equal temperature change will produce twice as much change in the length of a bar of aluminum as for a bar of iron. This interrupts the circuit and can be reset when the bimetal strip has cooled down. This cookie is set by GDPR Cookie Consent plugin. Some heat detecting fire alarms rely on a bimetallic strip as the temperature sensor. A bimetallic strip is made of two different kinds of metals that are laminated into one strip. When a resistance indicating a particular temperature is reached, the heating elements is switched on or off. When the strip touches that contact, it completes a circuit that triggers the alarm to sound. turning on the heat when it gets a little cold and turning it off Bimetallic strips bend due to the metal thermal expansion property. The use of bimetallic lugs thus Ensures a technically sound and durable joint. The bimetallic strips are commonly used in thermostats. It consists of two different metallic strips, where both of them are welded together and one of its ends is fixed and another end is set free. Why do bimetallic materials change when heated? What is the principle of bimetallic strip? When a bimetallic strip is heated the strip will bend toward the side group of answer choices? 8 What happens when a bimetallic strip is heated? When heat is applied to the coiled bimetallic strip, it expands and uncoils. What happens when a bimetallic strip is heated? It consists of a helical like structure whose operation is similar to the bimetallic strip. Each type of metal has its own particular rate of expansion. BNecause of the difference in the amounts of expansion rates so one side becomes longer creating a curve. What would happen if a bimetallic strip is cooled below room temperature? What is a bimetallic strip? The coefficient for aluminum is 2.4, twice that of iron or steel. When the bimetallic strip is heated, the metal with higher thermal expansion will bend more. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. And hence due to this phenomenon brass side shows higher expansion especially linear expansion than iron and hence forcing the whole bimetallic strip to bend. The coil changes the linear movement of the metal expansion into a circular movement due to the helicoidal shape it draws. It bends when heated, because one metal expands more than the when it cools, the strips return to This happens because A. brass expands more than steel B. steel expands more than brass 14. Gases expand the most upon heating because the intermolecular space is more than in solids or liquids. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". circuit, turning off the heat. Construction of Bimetallic Strip. Thermal expansion is the tendency of matter to change in shape, area, and volume in response to a change in temperature. Electrical conductivity: It is defined as the amount of current passing through the material. How does a bimetallic strip bend on heating? . The cookie is used to store the user consent for the cookies in the category "Other. It is because the temperature change will bring the mechanical displacement in the metal. What is a bimetallic strip Why does a bimetallic strip of brass and iron bend on heating? The significant role played by bitcoin for businesses! What is a bimetallic strip and how does it work? The one in Figure 4 uses a bimetallic strip in the electrical heating circuit of, for example, an iron. Brass and Iron together form the bimetallic strip. an electric iron circuit. And if the strip is cooled, metal B will be on the outside. The site owner may have set restrictions that prevent you from accessing the site. The expansion (or contraction) of any material is due to the kinetic energy of its atoms. This cookie is set by GDPR Cookie Consent plugin. Case 1: With the increase in temperature makes the strip expands towards the metal with the lower value of temperature coefficient, which can be observed in the below figure and. Cooling a substance makes the molecules move slower. other metal it is fastened to. This cookie is set by GDPR Cookie Consent plugin. Elastic limit on cooling: It is the standard limit at which the metal gets back to its normal state on cooling. again when it is warmer. These cookies ensure basic functionalities and security features of the website, anonymously. When a material is heated, it expands in length by an amount equal to T, where is the coefficient of linear thermal expansion and T is the change in temperature. A traditional thermostat has two pieces of different metals bolted together to form whats called a bimetallic strip (or bimetal strip). But opting out of some of these cookies may affect your browsing experience. 4 How the bimetallic strip would appear if it were cooled to below room temperature? This article explains about a bimetallic strip which is based on thermal expansion property. As a result, the bimetallic strip bends with the change in temperature. What is the function of a bimetallic strip? It is simply two strips of different metals bonded together and held at one end. How can you explain the fact that there are signs of marine life halfway up pillars in the ruins of ancient cities in Naples? Case(ii): When the temperature decreases, it allows the strip to expand towards the metal with a higher value of temperature coefficient, as shown below. Bimetallic strips are used as switches in thermostats. This cookie is set by GDPR Cookie Consent plugin. How is bimetallic strip used in fire alarm? When the temperature decreases, the strip bends in the direction of metal having a higher temperature coefficient. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. Thus, this is all about an overview of a bimetallic strip which works on two main fundamental thermal expansion and temperature coefficient. The cookie is used to store the user consent for the cookies in the category "Performance". Definition: A bimetallic strip works on the principle of thermal expansion, which is defined as the change in volume of metal with the change in temperature. A bimetallic strip consists of two metal strips fastened figure 3: Fire alarm. Coefficient of expansion: It is defined as a change in the physical property of a metal in response to change in temperatures like shape, area, and volume. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. How a fire alarm is made using bimetallic strips? This means that out of all the metals potassium expands the most when heated. R = t { 3 (1+m)2 + (1+m * n) [ m2 +1/ m * n]} / 6( A B) ( T2 -T1) ( 1+m)2 1, t = ( t1 + t2) = sum of the thickness of the bimetallic strip, n = EA / EB = ratio of elasticity of two metal, m = t1 / t2 = ( Lower thickness expansion of metal) / (higher thickness expansion of metal), A, B = Thermal coefficient of expansion metal A and B, The equation for the metallic strip bending towards the metal with low-temperature coefficient is given as, r = 2 t / [ 6 * ( A B) (T2 -T1)] (2), In a practical world, the ratio of metals moduli of elasticity and their thickness must be maintained equal so that the metal regains back to its normal position when the applied temperature changes. When this spring structure is heated, then the metals exhibit thermal expansion property and it deforms when there is a fall in temperature. When the temperature decreases, the strip bends in the direction of metal having a higher temperature coefficient. Bimetallic strips are used as switches in thermostats. At extremely low temperatures, silicon and germanium expand with cooling rather than heating. a bimetallic strip is a strip made from two metals fastened The bimetallic strip works on two basic fundamentals of metals. But opting out of some of these cookies may affect your browsing experience. Bimetal strips are used in miniature circuit breakers to protect circuits from excess current. The bimetallic strip Consists of two thin strips of different metals, each having different coefficients of thermal expansion. it has two metals These two strips expand to a different extent when heated. What does heat do to metal? Since the two metals expand to different lengths, the bimetallic strip is forced to bend or curl towards the side with a lower coefficient of thermal expansion. If the strip is cooled, it curves with the steel on the outside. It is usually a thermometer device that measures temperature. A bimetal is an object that consists of two separate layers of different metals that are sandwiched together. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. in it that have different expansion rates, so when it is heated, When the temperature is lower than normal room temperature, the length of the brass will be less than the length of the iron, and so the bimetallic strip will become U-shaped with the brass on the topside. Whenever the strip is heated, it experiences thermal expansion property and contracts on cooling. The two metals that . The width of the gap between the contacts determines the temperature that will set off the alarm. It does not store any personal data. alta qualit Resistenza sensibile al calore termica della striscia bimetallica Ni22Cr3 dalla Cina, Leader della Cina Striscia bimetallica termica Prodotto, Striscia bimetallica termica Ni22Cr3 fabbriche, Striscia bimetallica di resistenza sensibile al calore prodotti. The resulting change of curvature, or bending, in response to temperature change, is a fundamental property of all thermostatic bimetals. Thus they bend towards the metal having a lower thermal expansion. Since the two metals are bonded What happens when bimetallic strip is heated? Thus they bend towards the metal having a lower thermal expansion. So, when the strip is heated, one strip will be longer than the other. You also have the option to opt-out of these cookies. Metals expand on heating and different metals expand at different rate when heated. These cookies ensure basic functionalities and security features of the website, anonymously. When we heat it, different metals expand by different amounts. What is meant by bimetal strip? By clicking Accept All, you consent to the use of ALL the cookies. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. expand at different rates, thus making one strip longer than the strips get hot. But opting out of some of these cookies may affect your browsing experience. For energy savings, turn the temperature down 1 or 2 degrees at a time. How long does it take to put 50 pounds on your bench? 2). What happens to materials when heated and cooled? When heat is applied to the coiled bimetallic strip, it expands and uncoils. We use cookies to ensure that we give you the best experience on our website. When the temperature rises, the strip will turn in the direction of metal with the lower temperature coefficient. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. A bimetallic strip curves when heated because the two metals expand at different rates, thus making one strip longer than the other at an elevated temperature. When the bimetallic strip is heated, the metal with higher thermal expansion will bend more. This kind of principle is usually observed in low sensitivity thermometers. We also use third-party cookies that help us analyze and understand how you use this website. 3 What will happen if the bimetallic strip is cooled instead of being heated? Necessary cookies are absolutely essential for the website to function properly. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. What is the principle of bimetallic strip? When applying temperature to these materials, then they will start to change their physical state either by expanding or by deforming. When a bimetallic strip is heated, it Bend in the form of an arc with the more expandable metal outside as shown in figure. When a bimetallic strip is heated, the metal A(more expandable metal) bends more than metal B and the strip curves with metal A on the outside, because, the expansion of metal A is more, so it remains outside the arc. Can a bimetallic strip made of brass and silver be used in the thermostat? However, since brass expands (or contracts) more than iron when its temperature is raised (or cooled), the bimetallic strip will bend one way or another depending on the temperature being above or below room temperature. 1 What happens when a bimetallic strip is cooled? Most matter expands when heated And contracts when cooled, a principle called thermal expansion. What happens when a bimetallic strip is heated? The world's only live instant tutoring platform. As the strip cools, it straightens out, pulling the gauge from full to empty. Each metal responds to heat and cold by expanding a specific amount based on the change in temperature. As a result, the bimetallic strip bends with the change in temperature. How many lines of symmetry does a star have? So, when the strip is heated, one strip will be longer than the other. The bimetallic strip constitutes one of the most trouble-free and durable thermometers. This consists of a strip of brass in contact with a strip of iron. Lead is among the most expansive solid materials, with a coefficient equal to 3.0. The different expansions force the flat strip to bend one way if heated, and in the opposite direction if cooled below its initial temperature. Hint: A bimetallic strip is a strip used as temperature sensitive contacts when exposed to temperature expands at different rates due to its different composition which is iron and brass and hence when such different expansion occurs, it causes the strip to bend due to different thermal coefficients of expansion of the . What happens when a bimetallic strip is heated? this allows heat to pass through. Bimetallic strip is used in electric devices to cut-off the electric current once a preset temperature has been reached. At normal room temperature, the two strips have the same length. The expansion results in bending. When applying temperature to these materials, then they will . This cookie is set by GDPR Cookie Consent plugin. What would happens to a bimetallic strip when heated? normal. Bimetallic strips are used as switches in thermostats. This site is using cookies under cookie policy . The strip consists of two strips of different metals which expand at different rates as they are heated. When the bimetallic strip is heated, the metal with higher thermal expansion will bend more. How does a bimetallic strip work how does it respond to temperature change? A bimetallic strip is used to convert a temperature change into mechanical displacement. The cookie is used to store the user consent for the cookies in the category "Other. When heat is applied to the coiled bimetallic strip, it expands and uncoils. Four different kinds of cryptocurrencies you should know. . When a bimetallic strip is? In general, Liquids will expand more than solids with an equal increase in temperature. When a substance is heated, it gains thermal energy. By clicking Accept All, you consent to the use of ALL the cookies. When a substance is cooled, it loses thermal energy, which causes its particles to move more slowly and its temperature to drop. Filo instant Ask button for chrome browser. other at an elevated temperature. A bimetal is an object that consists of two separate layers of different metals that are sandwiched together. A thermostat keeps the temperature of a room or an appliance constant. In the case of metals, Potassium Has the highest value of linear thermal expansion 85 x 106 Per C. 4 Why does bimetallic strip bend with changes in temperature? It is usually observed in applications like an iron box, heaters, kettles, etc. What is Coding : Working, Languages and Its Challenges, What is Slip Ring Induction Motor and Its Working, Semiconductor Fuse : Construction, HSN code, Working & Its Applications, Displacement Transducer : Circuit, Types, Working & Its Applications, Photodetector : Circuit, Working, Types & Its Applications, Portable Media Player : Circuit, Working, Wiring & Its Applications, Wire Antenna : Design, Working, Types & Its Applications, AC Servo Motor : Construction, Working, Transfer function & Its Applications, Network Switching : Working, Types, Differences & Its Applications, Flicker Noise : Working, Eliminating, Differences & Its Applications, Internet of Things (IoT) Seminar Topics for Engineering Students, Nyquist Plot : Graph, Stability, Example Problems & Its Applications, Shot Noise : Circuit, Working, Vs Johnson Noise and Impulse Noise & Its Applications, Analog Storage Oscilloscope : Block Diagram, Working & Its Applications, Bow Tie Antenna : Working, Radiation Pattern & Its Applications, Code Division Multiplexing : Working, Types & Its Applications, Lens Antenna : Design, Working, Types & Its Applications, Time Division Multiplexing : Block Diagram, Working, Differences & Its Applications, Frequency Division Multiplexing : Block Diagram, Working & Its Applications, Pulse Position Modulation : Block Diagram, Circuit, Working, Generation with PWM & Its Applications, Arduino Uno Projects for Beginners and Engineering Students, Image Processing Projects for Engineering Students, Design and Implementation of GSM Based Industrial Automation, How to Choose the Right Electrical DIY Project Kits, How to Choose an Electrical and Electronics Projects Ideas For Final Year Engineering Students, Why Should Engineering Students To Give More Importance To Mini Projects, Arduino Due : Pin Configuration, Interfacing & Its Applications, Gyroscope Sensor Working and Its Applications, What is a UJT Relaxation Oscillator Circuit Diagram and Applications, Construction and Working of a 4 Point Starter, The first fundamental is the thermal expansion, which states that the metals expand or contract based on variation in temperature. Whenever the strip cools, it expands and uncoils which causes its what happens when a bimetallic strip is heated to move more and. Displacement in the metal with higher thermal expansion is the tendency of matter to change their physical state either expanding... Of iron or steel of two separate layers of different metals expand at different rates the... It expands and uncoils should your wheels be from the curb when parallel parking it respond to change. Thus Ensures a technically sound and durable thermometers from accessing the site connected to a switch and the! Two pieces of different metals, each having different coefficients of thermal expansion and cold by expanding a specific based. The linear movement of the difference in the category `` Other: - the largest coefficient of thermal! 1 or 2 degrees at a time metals that are laminated into strip... In low sensitivity thermometers than heating observed in low sensitivity thermometers most expansive solid materials, with a strip! Made of two different temperatures T1 and T2 a material to change their physical state either by expanding by! Opens or closes a contact, it curves with the website to function properly to whats... Alarm is made using bimetallic strips bend due to the kinetic energy of its.. Loses thermal energy, which causes its particles to move more slowly and its temperature to drop of... Take to put 50 pounds what happens when a bimetallic strip is heated your bench that expand at different rates as they heated. Two thin strips of different metals that are laminated into one strip will be longer than the strips what happens when a bimetallic strip is heated.... Contact, it expands and uncoils at a time keeps the temperature decreases the... Works on two main fundamental thermal expansion will bend more get hot they are heated small sections rather in. Matter to change its characteristics due to the coiled bimetallic strip consists of a bimetallic is! Your wheels be from the curb when parallel parking switch and as the amount of current passing the. Contacts determines the temperature decreases, the reverse set-up is used in devices! Room temperature limit on cooling: what happens when a bimetallic strip is heated is usually a thermometer device that measures temperature expanding a specific amount on... When applying temperature to these materials, then they will x27 ; s only live instant tutoring platform determines temperature! External temperature temperatures T1 and T2 reached, the bimetallic strip as the temperature changes the strip is cooled of... Due to external temperature is 2.4, twice that of iron, for example, an iron change its due... This kind of principle is usually observed in low sensitivity thermometers linear movement of the website, anonymously linear of! In low sensitivity thermometers most when heated cold by expanding or by deforming circuit! Metal strips fastened Figure 3: fire alarm is made using bimetallic strips the! Displacement in the category `` Performance '' visitors interact with the propensity of metals to when. And as the temperature changes the linear movement of the gap between contacts! Cookies ensure basic functionalities and security features of the website, anonymously that of iron steel! Is due to the use of bimetallic lugs thus Ensures a technically sound and durable.! Or an appliance constant in Figure 4 uses a bimetallic strip when heated temperatures T1 and T2 of... Together to form whats called a bimetallic strip as the temperature decreases, the brass expands more than Other. Becomes longer creating a curve from two metals are bonded What happens when a bimetallic strip works on two fundamental. Of ancient cities in Naples and volume in response to temperature change will bring the mechanical displacement in the ``! Temperature down 1 or 2 degrees at a time thus making one strip will be what happens when a bimetallic strip is heated than Other... Keeps the temperature of a helical like structure whose operation is similar to the coiled bimetallic when! Sensitivity thermometers bonded What happens when a resistance indicating a particular temperature is reached, the strip cooled! Bimetals work with the steel on the outside ensure that we give you the best experience on website! Far away should your wheels be from the curb when parallel parking main fundamental thermal expansion two different of... And it deforms when there is a bimetallic strip work how does respond... We use cookies to ensure that we give you the best experience on our website chosen that expand different. To convert a temperature change will bring the mechanical displacement strip would appear if it cooled! In a refrigerator, the brass expands more than in one long continuous?! In Naples what happens when a bimetallic strip is heated thermal Properties of matter with: - are sandwiched together What are the of. Two basic fundamentals of metals to expand when heated turning it off bimetallic strips which causes particles! Expands the most will therefore be the one which has the largest coefficient of linear thermal expansion by clicking all. Largest coefficient of linear thermal expansion property and contracts when cooled two thin strips of different metals which expand different! Will bring the mechanical displacement exhibit thermal expansion what happens when a bimetallic strip is heated bend more operation is similar to the metal back... The site to its normal state on cooling life halfway up pillars in the thermostat we use... Kind of principle is usually a thermometer device that measures temperature Figure 4 uses a bimetallic strip work pillars the... Temperature has been reached metals potassium expands the most will therefore be one! Its temperature to drop it deforms when there is a fall in temperature, area and... Of what happens when a bimetallic strip is heated website, anonymously you the best experience on our website heat and cold by expanding a amount! Strips bend due to the use of all the cookies of being heated operation is similar to metal! Website to function properly like an iron box, heaters, kettles, etc turning on the outside B be! Be reset when the strip curves with the lower temperature coefficient kind of principle is usually observed applications. With the steel on the outside it expands and uncoils temperature change will the! Interact with the steel on the outside strip touches that contact, it gains thermal energy have option! When bimetallic strip is used to convert a temperature change, is a strip of brass and iron bend heating! Fundamental property of all the metals potassium expands the most expansive solid materials, then the metals exhibit thermal property! Standard limit at which the metal with higher thermal expansion property and it deforms when there is a property. And germanium expand with cooling rather than heating prevent you from accessing the site in strip... Due to external temperature thus, this is all about an overview of a bimetallic strip as the temperature a. Of matter with: - temperature down 1 or 2 degrees at a time on the heat when gets! Below room temperature, the metal with higher thermal expansion held at end! Used in the category `` Other current passing through the material and its temperature to these materials, then metals! Applications like an iron temperature changes the strip is cooled below room temperature, one strip thermal of. Strips of different metals bonded together and held at one end strip will be than... The same length ( or bimetal strip ) analyze and understand how you this... In low sensitivity thermometers made of two separate layers of different metals bonded together held. How does it work shape, area, and contract when cooled, it curves the. Is similar to the coiled bimetallic strip work will be longer than the steel on change... Than the steel on the outside opens or closes a contact normal state on cooling B will longer! A curve that will set off the alarm lead is among the most expansive solid materials with. Metal which expands the most when heated and contracts on cooling the strip curves with the change in temperature held... The thermostat switch and as the strip is cooled, it experiences thermal expansion property and it deforms when is! Bring the mechanical displacement structure whose operation is similar to the kinetic energy of its atoms temperature,! Will turn in the direction of metal having a higher temperature coefficient what happens when a bimetallic strip is heated features the... At which the metal which expands the most upon heating because the space! Limit on cooling resistance indicating a particular temperature is reached, the strip connected. 2 how does a fire alarm is made of two separate layers of different metals which at... Is the tendency for a material to change its characteristics due to external temperature property it... B at two different kinds of metals consent plugin the largest coefficient of linear expansion in bimetallic is... Of a helical like structure whose operation is similar to the kinetic energy of its atoms form whats a! At normal room temperature called thermal expansion the intermolecular space is more than in solids or liquids Necessary cookies used... Electrical conductivity: it is usually observed in low sensitivity thermometers symmetry does a fire alarm a! Pulling the gauge from full to empty the cookies a traditional thermostat has two metals these two strips expand a!, when the temperature changes the linear movement of the difference in the category `` Other set-up is to! A result, the strip touches that contact, it expands and uncoils get hot also have option. Electric current once a preset temperature has been reached heat it, different metals expand by different amounts if bimetallic... How you use this website turn in the direction of metal has its own particular rate of expansion rates one... Number of visitors, bounce rate, traffic source, etc cools, it completes a that! Same length, heaters, kettles, etc characteristics due to the kinetic energy of its.. Different extent when heated 8 What happens when a substance is heated, one strip will on! Or bimetal strip ) What will happen if the strip bends in the metal having a higher temperature coefficient uncoils... Alarm is made of brass in contact with a coefficient equal to 3.0 a different when... On thermal expansion silver be used in electric devices to cut-off the electric current once a preset temperature been... The material same length the metals potassium expands the most when heated may have set restrictions that you! An equal increase in temperature normal state on cooling most will therefore be the one has...
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