Low temperature is obtained by changing the pressure (vacuum)
Any physical process that accompanies cryogenic heat absorption can be used for refrigeration. One is phase change refrigeration, which USES the evaporation of a liquid at a low temperature or the melting or sublimation of a solid at a low temperature to extract heat from the object being cooled. The other is by changing the pressure of the steam above the liquid, so as to change the temperature of the liquid pool, such as gas adiabatic expansion refrigeration, high pressure gas adiabatic expansion can reach a lower temperature, make low pressure gas reheat can be made cold.
IKS PVD, we are manufacturer of vacuum coating machine from China, more details, contact: email@example.com