Standard atmosphere (atm)
Exactly 101 325 pascals.
What is a standard atmosphere?
- Symbol
- atm
- Quantity
- Pressure
- Unit system
- other
- Definition
- Exactly 101 325 pascals.
- Exact
- Yes, the value is exact by definition
- Source
- NIST Special Publication 811 (2008), Appendix B.8
Common applications
A reference pressure equal to typical air pressure at sea level. Used in chemistry, physics and diving.
Standard atmosphere in other pressure units
- 1 atm = 101325 PaPascal
- 1 atm = 1013.25 hPaHectopascal
- 1 atm = 101.325 kPaKilopascal
- 1 atm = 0.101325 MPaMegapascal
- 1 atm = 0.000101325 GPaGigapascal
- 1 atm = 1013.25 mbarMillibar
- 1 atm = 1.01325 barStandard atmosphere to Bar converter
- 1 atm ≈ 1.033227453 atTechnical atmosphere
- 1 atm = 760 TorrTorr
- 1 atm ≈ 759.9998917 mmHgMillimeter of mercury
- 1 atm ≈ 14.69594878 psiStandard atmosphere to Pound-force per square inch converter
- 1 atm ≈ 0.01469594878 ksiKilopound-force per square inch
Standard atmosphere quick reference
| Standard atmosphere | Bar | Pound-force per square inch | Pascal |
|---|---|---|---|
| 1 atm | = 1.01325 bar | ≈ 14.69594878 psi | = 101325 Pa |
| 10 atm | = 10.1325 bar | ≈ 146.9594878 psi | = 1013250 Pa |
| 100 atm | = 101.325 bar | ≈ 1469.594878 psi | = 10132500 Pa |
| 1000 atm | = 1013.25 bar | ≈ 14695.94878 psi | = 101325000 Pa |
Where the standard atmosphere fits
The next smaller pressure unit is the bar (bar). 1 atm = 1.01325 bar, and 1 bar ≈ 0.9869232667 atm.
The next larger pressure unit is the megapascal (MPa). 1 atm = 0.101325 MPa, and 1 MPa ≈ 9.869232667 atm.
Frequently asked questions
- How many bars are in one standard atmosphere?
- One standard atmosphere = 1.01325 bar (bars).
- How many psi are in one standard atmosphere?
- One standard atmosphere ≈ 14.69594878 psi (psi).
- How many pascals are in one standard atmosphere?
- One standard atmosphere = 101325 Pa (pascals).