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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
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
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 steam... read more
1.Pa pascal：International unit of pressure, 1Pa = 1N/m2. 2.Torr torr：Unit of pressure, 1 Torr = 1/760 atm.China PVD Coating Systems suppliers atm standard atmosphere：Unit of pressure, 1atm=101325Pa。 3.mbar millibar：Unit of pressure, 1mbar=102Pa。 4.partial pressure：Pressure of a component in a mixture of gases. 5.total pressure：The sum of the pressures of all components in the mixture. 6.vacuum：The state of a gas below ambient atmospheric pressure in a specified space. 7.degree of vacuum：The degr... read more
standard ambient condition：The temperature is 20℃, the relative humidity is 65%, and the atmospheric pressure is101325Pa=1013.25mbar=760Torr。PVD Coating Systems suppliers standard reference conditions for gases：The temperature is 0℃ and the pressure is101325Pa. p pressure：When a gas molecule passes through a hypothetical plane, the momentum change rate along the normal direction of the plane is divided by the plane area or the normal component of the force acting on the surface of the container ... read more
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