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  • Common Vacuum Terminology 7

    Common Vacuum Terminology 7

    1.degassing:Artificial desorption of gases from materials. 2.outgassing:Gas is naturally desorbed from materials. 3.qGU desorption or outgassing or degassing rate:Within a given time interval, the gas flow rate (or molecular flow rate) of desorption (or deflation or degassing) from the material is divided by the time and the surface area.China Plasma Coating Machine suppliers 4.evaporation rate:The number of molecules (or mass or mass) evaporated from the surface within a given time interval div... read more

    29 Nov,2019 Industry News
  • Common Vacuum Terminology6

    Common Vacuum Terminology6

    1.adsorption:Adsorption of gases or vapors (adsorbates) on solid or liquid (adsorbents) surfaces. 2.physisorption:Adsorption due to physical action.Evaporation Vacuum Coating Machine Factory 3.chemisorption:Adsorption due to chemical action. 4.absorption:The diffusion of gas or vapor (adsorbate) into solid or liquid (adsorbent). 5.α accommodation factor:The ratio of the average energy exchanged between a particle incident on a surface and the actual energy exchanged on the surface to the average... read more

    21 Nov,2019 Industry News
  • Common Vacuum Terminology5

    Common Vacuum Terminology5

    1.diffusion of gas:Gas moves in another medium due to concentration gradient. Medium can be another gas (diffusion in this case is called interdiffusion) or a condensable substance. 2.D diffusion coefficient; diffusivity:The ratio of the absolute mass flow rate per unit area to the normal concentration gradient per unit area is obtained.China PVD Plating Machine Suppliers 3.viscous flow:The average free path of gas molecule is much smaller than the minimum cross-section size of the duct. Therefo... read more

    15 Nov,2019 Industry News
  • Common Vacuum Terminology 4

    Common Vacuum Terminology 4

    1.ψ collision rate:In a given time interval, the average number of collisions of a molecule (or other specified particles) relative to other gas molecules (or other specified particles) divided by that time. The average number of collisions should be obtained at a sufficient number of molecules and a sufficient time interval.China Decorative Vacuum Coating Machine Manufacturers 2.χ volume collision rate:In a given time interval, the average number of collisions between gas molecules in the space... read more

    09 Nov,2019 Industry News
  • Common Vacuum Terminology 3

    Common Vacuum Terminology 3

    ranges of vacuum:The vacuum region is roughly divided as follows:                       Pa        Torr Low vacuum:            105~102         760~1 Medium vacuum:          102~10-1        1~10-3 High vacuum:            10-1~10-5       10-3~10-7 Ultra-high vacuum:       <10-5           <10-7 gas:Substances that are free to occupy any space and are not subject to intermolecular interactions. Note: In vacuum technology, the term "gas" is not strictly applied to non-condensable gases and ... read more

    01 Nov,2019 Industry News

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