The working principle of gas thermometer and species

You see most of the thermometer is liquid thermometer, a lot of people will not believe that there are gas thermometer. Don't believe that, with the liquid thermometer, gas thermometer can also be some. Below, the small surface is to briefly introduce gas thermometer for everybody. The working principle of the first gas thermometer for the gas thermometer is the use of a certain quality of gas as working substance, like liquid thermometer, is using the principle of heat bilges cold shrink packing quality work. Gas thermometer is in the container with a hydrogen or helium as temperature measurement, this is because the hydrogen and helium liquefaction temperature is very low and close to absolute zero, so the gas thermometer temperature range is very wide, and the accuracy is high, thermometer used for precision measurement. Say that finish work principle of the gas thermometer for type! Gas thermometer can be divided into two types: constant volume gas thermometer and constant pressure gas thermometer. Constant volume gas thermometer, is to keep the gas volume and gas pressure to calculate the measured temperature of a device. In the process of actual measurement, the influence of various error must also be taken into account, the results of measurement must be revised, so slightly less accuracy. The other is a constant pressure gas thermometer, refers to keep the constant pressure of the gas, calculated by the volume of a gas measured temperature of the device. This kind of structure is more complicated than the constant volume gas thermometer thermometer, operation and correction work is much more trouble, except in the high temperature range, commonly used in the practical work of constant volume gas thermometer.