The standard atmosphere (symbol: atm) is a unit of pressure. 3 atm is equivalent to 0.3MPa. Choose the compressor which can maintain this level of atmospheric pressure.
Also there’s an item has the indication like “1.0kgf/cm2” on its label. 1.0kgf/cm2 can be converted into 0.1MPa (1 atmosphere [standard] = 0.101325MPa).
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