What kind of household pressure type thermometer is?

The working principle of pressure type thermometer is according to the heat in sealed containers within the medium pressure with temperature changing principle of to measure temperature. Pressure type thermometer is mainly composed of spring tube, connected to the capillary tube and bulb. Its internal and a heat medium of a closed system. Bulb under the condition of heat, increase the stress direction along the spring tube in transmission organization leads, the instrument pointer will to a certain extent affect the elastic deformation of the spring pipe, and display the temperature. We usually in industrial equipment or see it on the ship. Recently in a net play I saw above the pressure type thermometer, a look at carefully, turned out to be used in the bathroom, use it to measure the temperature of the bath, a brainwave, give it a new name - A bath thermometer, so domestic pressure type thermometer is the bath thermometer. Can be free to choose the length of the metal hose, let it on the installation position had more space; Seal design to make it in the bathroom is not affected by any the damp environment.