What this tool does
Convert standard atmospheres to bar, psi, kilopascals, pascals, mmHg, inHg and torr. Type an amount in standard atmospheres, choose the units, and the tool converts it to bars. It offers 8 pressure units and also shows the same amount in the others.
Inputs
- Value: A number.
- From: Choose one: Standard atmosphere, Bar, Pound-force per square inch (psi), Kilopascal, Pascal, Millimeter of mercury (conventional), Inch of mercury (conventional), Torr. Starts as Standard atmosphere.
- To: Choose one of the same 8 units as "From". Starts as Bar.
How to use
- Enter the amount you want to convert.
- Choose the unit to convert from and the unit to convert to.
- Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.
Worked examples
Conversions from standard atmospheres to bars:
- 1 atm = 1.01325 bar
- 5 atm = 5.06625 bar
- 10 atm = 10.1325 bar
- 50 atm = 50.6625 bar
- 100 atm = 101.325 bar
Multiply the number of standard atmospheres by 1.01325 to get bars. Both units are exact definitions, so 1.01325 is the exact factor: 1 atm = 1.01325 bar.
Sources: Standard atmosphere: 10th CGPM (1954). Bar: SI Brochure, 9th edition (2019), Table 8 note.
Limitations
- Converts the standard atmosphere (atm) only. The technical atmosphere (at) is a different unit and is not used here.
- Millimeters and inches of mercury use the conventional definition.
FAQs
- Q: How many pascals are in one atmosphere?
- A: One standard atmosphere is defined as exactly 101,325 pascals, which is 101.325 kilopascals or 1.01325 bar.
- Q: Is a standard atmosphere the same as the pressure outside today?
- A: No. The standard atmosphere is a fixed reference value. Real air pressure changes with weather and altitude.
- Q: How many psi is one atmosphere?
- A: One standard atmosphere is about 14.696 psi.
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