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Pneumatic components gas state term definition description

Pneumatic component gas state term definition
[density ρ]
The mass of gas contained in a unit volume is called density. The unit is kg/m3.
[pressure p]
Pressure can be measured in terms of absolute pressure, gauge pressure, and vacuum.
[absolute pressure]
The pressure value with the absolute vacuum as the starting point. Generally, "ABS" is marked on the lower right foot of the symbol indicating absolute pressure, that is, PABS
[Table pressure]
Above the pressure of the local atmospheric pressure. The pressure value measured by the pressure gauge is the gauge pressure. In engineering calculations, the local atmospheric pressure is often replaced by standard atmospheric pressure, that is, Pa = 101,325 Pa.
[vacuum degree]
Below the local atmospheric pressure value.
[vacuum pressure]
The difference between absolute pressure and atmospheric pressure. The vacuum pressure is numerically the same as the vacuum, but should be preceded by a minus sign.
[Temperature T]
The thermodynamic temperature T is commonly used in engineering calculations. The unit name is open [Er], the unit symbol is K, and the conversion relationship between Celsius (°C) in our life is: T=t-T0, T0=273.15K
[Standard status]
It refers to the state of air at a temperature of 20 ° C, a relative humidity of 65%, and a pressure of 0.1 MPa.
In the standard state, the density of air ρ = 1.185 kg / m3. According to the international standard ISO8778, the unit under the standard status can be marked with "(ANR)".
[reference status]
Refers to the state of dry air at a temperature of 0 ° C and a pressure of 101.3 Kpa. In the reference state, the density of air ρ = 1.293 kg/m3.
[ideal gas]
A gas that is not viscous is called an ideal gas. The aim is to simplify the problem solving.
[complete gas]
It is an imaginary gas. Its molecules are some elastic, non-volume-sized particles. There is no interaction between the molecules except for collisions. It is completely different from the ideal gas without viscosity.
The actual gas can be regarded as a complete gas as long as it is not at a very high pressure or a very low temperature. Calculated according to the complete gas state equation, the error will not be too large.

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