Bimetallic Strips
双金属片
Bonding two metals with dissimilar thermal expansion coefficients can produce useful devices for detecting and measuring temperature changes. A typical pair is brass and steel with typical expansion coefficients of 19 and 13 parts per million per degree Celsius respectively.
将热膨胀系数不同的两种金属连接起来可以制造出用于检测和测量温度变化的有用装置。典型的一对是黄铜和钢，它们的典型热膨胀系数分别为19和13 parts per million per degree Celsius。
The examples shown are straight strips, but bimetallic strips are made in coils to increase their sensitivity for use in thermostats. One of the many uses for bimetallic strips is in electrical breakers where excessive current through the strip heats it and bends it to trip the switch to interrupt the current.
所展示的例子是直条，但双金属条通常制成螺旋状以提高其灵敏度，用于电热器。双金属条的许多用途之一是在电路断路器中，当通过条的电流过大时，它会因发热而弯曲，从而触发开关切断电流。
| Example with liquid nitrogen
液氮示例 |
索引
| HyperPhysics***** Thermodynamics
HyperPhysics ***** 热力学 | R Nave |
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