The so-called vacuum, is in a given space, the pressure is below 101325Pa gas state. In a vacuum, the leanness of a gas is usually expressed as the pressure of the gas. Obviously, the lower the pressure, the thinner the gas.
Drying machine is used for drying wet materials, remove the moisture in the materials. It includes hot air drying, vacuum drying, fluid bed drying, conduction type drying and so on.
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