Solid liquid gas three different temperature measurement of the difference of the thermometer

The thermometer, it is the floorboard of the temperature measuring instrument, can accurate judgment and measuring temperature. It USES solid, liquid and gas is influenced by temperature and heat bilges cold shrink phenomenon is designed. With alcohol thermometer, mercury thermometer, gas thermometer, bimetallic thermometer thermometer for us to choose from. But, do you know the solid liquid gas three different temperature measurement of the difference of the thermometer? Bimetallic thermometer main component is a use two or more pieces of metal laminate composed of multilayer metal together. Is usually made of metal spiral coil shape, one end fixed and the other end connected to a free rotating pointer. Two kinds of metal is not the same as the amount of volume change as the temperature changes, so will be bent. So when the bimetallic strip feel the temperature change, Pointers can be on a circular dividing scale to indicate the temperature. Bimetallic thermometer and liquid and the gas thermometer thermometer USES similar, but can be used under the condition of higher mechanical strength. Liquid thermometer is used in temperature measurement of liquid in the container, with the temperature change caused by the change of volume, with the change of the liquid column position to determine the temperature of a device that USES the heat bilges cold shrink effect of the temperature measuring principle. Sensitivity of liquid thermometer is associated with the difference between the thermal expansion coefficient of the liquid in measuring temperature, and is proportional to the. Usually choose coefficient of thermal expansion larger liquid as liquid temperature, water and alcohol. Gas thermometer USES a certain quality of gas as working substance of the thermometer. With gas thermometer measured temperature and thermodynamic temperature are identical with each other. General use of hydrogen or helium temperature material, because the hydrogen and helium liquefaction temperature is very low, close to absolute zero, so its temperature range is very wide. This kind of high precision thermometer, used for precision measurement. Gas thermometer has two types: constant volume gas thermometer and constant pressure gas thermometer.