What is a atmosphere?
Definition
atm
The atmosphere (atm) is a reference pressure unit equal to the average atmospheric pressure at sea level: 101,325 pascals.
Unit system
Reference
Convert atmospheres
All pressure units
| Unit | Symbol | System |
|---|---|---|
| pascals | Pa | SI / Metric |
| kilopascals | kPa | SI / Metric |
| megapascals | MPa | SI / Metric |
| bar | bar | SI / Metric |
| millibars | mbar | SI / Metric |
| PSI | psi | Imperial |
| atmospheres | atm | Reference |
| torr | Torr | Scientific |
| mmHg | mmHg | Medical |
| inches of mercury | inHg | Aviation |
| inches of water | inH₂O | Engineering |