What's the difference between a bimetallic thermometer and glass thermometer?

The floorboard of the thermometer is an instrument for measuring temperature, according to the working principle of using the environment, etc, can be further subdivided the thermometer. The bimetallic thermometer and glass thermometer is carried out in accordance with the working principle of different segmentation results. So the bimetallic thermometer and working principle of the biggest different glass thermometer is different. Bimetallic thermometer is the use of two different metal working 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. Glass is according to the mercury thermometer, alcohol, toluene, etc liquid has obvious physical properties of heat bilges cold shrink.