Pascals (Pa) to Atmospheres (atm) Conversion
Pascals
The pascal (Pa) is the SI derived unit of pressure, defined as one newton per square metre (N/m²), named after French mathematician Blaise Pascal who studied fluid pressure in the 17th century. Standard atmospheric pressure at sea level is 101,325 Pa (101.3 kPa). The pascal is a small unit for everyday use — a gentle breeze exerts approximately 1 Pa of dynamic pressure — so kilopascals (kPa) and megapascals (MPa) are more common in practical engineering contexts.
Atmospheres
The standard atmosphere (atm) is a unit of pressure defined as exactly 101,325 Pa, representing the approximate mean atmospheric pressure at sea level. It remains in use in chemistry for expressing gas pressures in thermodynamic tables and standard conditions (STP: 0 °C and 1 atm). One atmosphere supports a mercury column of exactly 760 mm — the basis of the mercury barometer invented by Torricelli in 1643. In deep-sea diving, pressure is expressed in atmospheres absolute (ATA).
| Pascals (Pa) | Atmospheres (atm) |
|---|---|
| 0.1 Pa | 0.000000987 atm |
| 1 Pa | 0.00000987 atm |
| 2 Pa | 0.0000197 atm |
| 3 Pa | 0.0000296 atm |
| 5 Pa | 0.0000493 atm |
| 10 Pa | 0.0000987 atm |
| 20 Pa | 0.000197 atm |
| 30 Pa | 0.000296 atm |
| 50 Pa | 0.000493 atm |
| 100 Pa | 0.000987 atm |
| 1000 Pa | 0.00987 atm |
Frequently Asked Questions (FAQ)
How many atmospheres are in 1 pascals?
1 pascals (Pa) is exactly 0.00000987 atmospheres (atm).
How do I convert pascals to atmospheres?
Multiply the value in pascals by 0.00000987 to get the result in atmospheres. Or use the converter above — type any number and see the result instantly.