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The volume component of various gases in air is: N2:78.084%、O2: 20.9476%. Argon: 0.9364%. CO2: 0.0314%. Others and H2、CH4、H2O、O3、SO2、NO2And so on, but the content is very small.
Nitrogen -- as the most abundant gas in the air, it can be used endlessly. It is colorless, odorless, odorless and non-toxic, and it is an lazy gas at normal temperature, which does not maintain life. Nitrogen (N2) The content in the air is 78.084%, molecular weight is 28, Boiling Point:-195.8 ℃, condensation point:-210 ℃.
The purity of nitrogen -- mainly refers to the content of non-oxidation gas, which includes lazy gas such as nitrogen and argon, and trace gas such as carbon dioxide and water molecules. Commonly used unit is % (volume content of nitrogen) or oxygen content unit ppm (one million or 10-6), Ppb (1 billion or 10-9)
The dew point of water -- at a certain pressure (under normal pressure), when the gas water molecules in the air are saturated, it will condense into the temperature point of liquid water.
Pressure -- in engineering habits, the main indication is relative pressure, that is, the field altitude is within 100 meters, and the pressure under atmospheric pressure represents numerical value.
Flow rate -- in unit time, the volume of gas passing through the measuring point under normal pressure.
Separation of air to produce nitrogen -- the process of releasing oxygen by physical or chemical methods and extracting lazy gases such as nitrogen from the atmosphere on which people live under normal temperature.
Nitrogen-the abbreviation of nitrogen gas whose volume content is lower than the purity of 99.9%.
High purity nitrogen-the abbreviation of nitrogen gas whose volume content is higher than the purity of 99.95%.
Oil content -- in the process of air compression, because the compression head needs to be lubricated with lubricating oil, the oil mist will mix into the compressed air. After filtration, the volume content of the remaining oil and gas in the compressed gas (unit mg/m3), Usually expressed in ppm.
