Standard Atmosphere is mainly used as a reference value for the average atmospheric pressure at sea level. It is often used to indicate the depth rating for a water resistant watch, but otherwise is rarely used as a unit for measuring pressure. 1 Standard Atmosphere is defined as being exactly equal to 101,325 Pascals.
Since the atmospheric presssure varies with changes in weather and altitude, it is convenient to standardise on a single value so that ratings, measurements and specifications can be compared. In particular 1 Standard Atmosphere is used by the Aviation industry as the reference standard for sea level pressure.
In the table below you will find the equivalent values for 1 atm in other pressure units.
To calculate the number of atmospheres for a pressure value in other units please click on the relevant unit link below.
For converting many readings to or from atmospheres please use our pressure unit calculator.
|10332.3||mmH2O 4°C (39.2°F)|
|1033.23||cmH2O 4°C (39.2°F)|
|10.3323||mH2O 4°C (39.2°F)|
|406.782||inH2O 4°C (39.2°F)|
|33.8985||ftH2O 4°C (39.2°F)|
|760||mmHg 0°C (32°F)|
|76||cmHg 0°C (32°F)|
|29.9213||inHg 0°C (32°F)|
|760000||µHg 0°C (32°F)|
|0.00656069||tsi (uk, long)|
|0.00734797||tsi (usa, short)|
|1.05811||tsf (usa, short)|
Please note that the conversion factors above are accurate to 6 significant figures.
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