Vacuum degree

Vacuum degree: It indicates the thinness of gas under vacuum conditions and is usually expressed by a pressure value of 9. Gas: A substance that is not constrained by intermolecular forces and can freely occupy any space. (Note: In vacuum technology, the term "gas" is not strictly applied to non-condensable gases and vapors.) 10. Non-condensable gases: Gases above the critical temperature, that is, gases that cannot be liquefied simply by increasing the pressure. 11. Steam: A gas below the critical temperature, that is, a gas that can be liquefied simply by increasing the pressure. twelve Saturated vapor pressure: At a given temperature, the vapor pressure of a certain substance and its condensed phase are in a state of phase equilibrium. 13. Saturation: The ratio of vapor pressure to its saturated vapor pressure. fourteen Saturated steam: Steam with a pressure equal to its saturated vapor pressure at a given temperature. 15. Unsaturated steam: Steam with a pressure lower than its saturated vapor pressure at a given temperature.

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