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A bi-metallic strip is made of two different metals. (Duh!)
Each metal has its OWN coefficient of thermal expansion, so when it heats up, one side expands more than the other does. The side that expands more causes the strip to bend toward the side that expands less.
Wiki User
∙ 15y ago
Wiki User
∙ 15y agoTthat is how a bimetallic strip functions; it's raison d'etre is to move as the temperature changes. It won't necessarily always be the upper or lower; it could be the left ot right, front or back. The premise is that each of the two metals reacts differently to changes of temperature. one gets shorter (or longer) sooner, deforming the composite strip in the direction of the shorter one. This deformation causes movement that at its simplest makes a (calibratable) thermometer. More complex uses of bimetallic strips involve them moving something else- opening or closing contacts to a relay or directly locking (or ulnlocking) an item under specified (designed) temperature conditions.
Wiki User
∙ 12y agoAs the temperature rises (or falls) one of the two metals expands (or contracts) faster than the other. Since the total length must remain the same (for both), the strip must bend (with the longer piece on the outside of the curve.
Wiki User
∙ 12y agoTwo metals with different properties (such as rate of thermal expansion) when bonded together will bend when the temperature changes because the one that expands most tries to pull the other but cant because it does not expand as much so the one that expands most becomes the outside (convex side) of the bent strip.
Wiki User
∙ 15y agoThe metal with a higher coefficient of thermal expansion.
Wiki User
∙ 12y agoA bimetallic bends when heated as there is an uneven expansion in both the metals.
Wiki User
∙ 11y agoYou must see which metal forces the other metal to push forward and that metal expands the most
Wiki User
∙ 11y agoA bimetallic strip bends when heated because of the difference in coefficients of thermal expansion of the two metals - one half of the strips expands more than the other.
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