What is the mechanical expansion thermometer?

Mechanical expansion thermometer is a kind of thermometer, it works mainly with the property of the thermal components of heat bilges cold shrink to transformation, so as to achieve the purpose of temperature measurement of heat. Today we talk about our common mechanical expansion thermometer. Glass thermometer, glass thermometer is the use of the principle of heat bilges cold shrink to realize the halo measurement of temperature. Due to the expansion coefficient of medium and the boiling point and freezing point of difference, so we common glass thermometer mainly include: water thermometer kerosene thermometer, mercury thermometer, the red pen. Pointer thermometer is made using the principle of heat bilges cold shrink bimetallic strip. Bimetallic strip is usually objects with copper and iron rivet together, and copper in the left, iron on the right. As a result of the copper heat bilges cold shrink effect is more obvious than iron, so when the temperature rises, the copper pull plate bending a pointer to the right under the drive of bimetallic strip will turn to the right; On the other hand, the temperature become low, pointer under the drive of bimetallic strip to indicate the temperature. We can according to need to choose suitable for the thermometer.