This is because copper expands more than iron when heated, causing the side with copper to elongate and bend towards the iron side. This phenomenon is known as thermal expansion and is utilized in devices like thermostats to control temperature.
Bimetallic strips are used in thermostats where two metals, usually steel and copper, are layered together and heated to create a coil that bends with changes in temperature.
A bimetallic strip bends when heated because the two metals it is made of have different coefficients of thermal expansion. As the strip is heated, one metal expands more than the other, causing the strip to curve.
When a bimetallic strip is heated, the metal with the higher coefficient of thermal expansion expands more than the other metal, causing the strip to bend towards that metal. This bending is due to the unequal expansion and contraction of the two metals when exposed to different temperatures.
The bimetallic strip bends towards the material with the higher coefficient of thermal expansion. This is because the material with the higher coefficient expands more when heated, causing the strip to bend towards that side.
The copper has a higher thermal expansion coefficient than the iron. The copper wants to get longer relative to the iron so the bar bends away from the iron strip. For example if iron is on top and copper on the bottom the bar bows downward. This seems opposite to your question conclusion
The bimetallic strip bends.
Bimetallic strips are used in thermostats where two metals, usually steel and copper, are layered together and heated to create a coil that bends with changes in temperature.
A bimetallic strip bends when heated because the two metals it is made of have different coefficients of thermal expansion. As the strip is heated, one metal expands more than the other, causing the strip to curve.
When a bimetallic strip is heated, the metal with the higher coefficient of thermal expansion expands more than the other metal, causing the strip to bend towards that metal. This bending is due to the unequal expansion and contraction of the two metals when exposed to different temperatures.
The bimetallic strip bends towards the material with the higher coefficient of thermal expansion. This is because the material with the higher coefficient expands more when heated, causing the strip to bend towards that side.
The copper has a higher thermal expansion coefficient than the iron. The copper wants to get longer relative to the iron so the bar bends away from the iron strip. For example if iron is on top and copper on the bottom the bar bows downward. This seems opposite to your question conclusion
Two metals making up the strip have different rates of expansion, so as heat is applied and the metals expand, one metal will expand faster than the other, causing that side to grow longer faster than the other side. Since the faster growing metal strip is bonded to the slower expanding, now shorter piece of metal, some movement must occur and the only means of movement is to bend.
When the temperature of the iron increases, the bimetallic strip bends upwards. This breaks the contact between the strip and the heating coil. When the temperature falls, the bimetallic strip bends down and the contact is restored.
Bimetallic strip
Bimetallic thermometers work based on the principle that two different metals expand at different rates when heated. A bimetallic strip is made by bonding two different metals with different thermal expansion coefficients together. When the temperature changes, the strip bends due to the uneven expansion of the two metals, which is then measured to indicate the temperature.
This phenomenon is known as bimetallic strip. When the two metals expand at different rates, due to their different coefficients of thermal expansion, the strip bends as one side elongates more than the other when heated.
A strip consisting of two metals that bends with a rise in temperature