Bimetallic thermometer with common glass thermometer respectively?

Bimetallic thermometer and common glass thermometer is used to measure the dielectric thermometer, the bimetallic thermometer with common glass thermometer respectively? Distinguish between the two thermometer can be in two ways: 1. Appearance, common bimetallic thermometer generally by the table, watch case, joint on the lid, pan, and heat pipe; While ordinary glass thermometer is at least composed of a glass rod and other accessories; Working principle of bimetallic thermometer is the use of two different metals in the principle of expansion degree of different temperature changes. Bimetallic thermometer is mainly used in industry of element is one with two or more pieces of metal laminate composed of multilayer metal together. To improve the temperature measuring sensitivity, is usually made of metal spiral coil shape. When multi-layer metal temperature change, the layers of metal expansion or contraction, makes the spiral coil rolled up or let go. As a result of the spiral coil end fixed and the other end connected to a free rotating pointer, therefore, when the bimetallic strip feel the temperature change, Pointers can be on a circular dividing scale to indicate the temperature. And ordinary glass is based on a mercury thermometer, alcohol, toluene, etc liquid has obvious physical properties of heat bilges cold shrink. In the practical use, we can according to need to choose a suitable thermometer.