Atmosphere (unit)

The standard atmosphere (symbol: atm) is a unit of atmospheric pressure. It refers to the air pressure at sea level and is defined as equal to 101,325 Pa.[1]

Since 1982, it has been replaced by the bar, which is exactly 105 Pa.[2] The use of either unit is discouraged.

References
  1. BIPM Definition of the standard atmosphere
  2. IUPAC.org, Gold Book, Standard Pressure


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