Recognised as Physical constant
Standard atmosphere
- atm
- Exact by definition
- physico chemical
Standard atmosphere (atm) is 101,325 Pa. A defined reference pressure, not a measurement of the actual atmosphere. Values follow CODATA 2018 (2019 SI redefinition).
Value
Value101,325 Pa
Scientific notation1.01325 × 10^5 Pa
UnitPa
Symbolatm
ExactnessExact by definitionA defined reference pressure, not a measurement of the actual atmosphere.
Reciprocal9.869232667 × 10^-6
Order of magnitude10^5
Multiples
× 22.0265 × 10^5
× 101.01325 × 10^6
× 1001.01325 × 10^7
× 1,0001.01325 × 10^8
× 0.55.06625 × 10^4
× 0.11.01325 × 10^4
Provenance
DatasetCODATA 2018 (2019 SI redefinition)
Categoryphysico chemical
Why it mattersA defined reference pressure, not a measurement of the actual atmosphere.
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