Pounds per square inch (psi) to Atmospheres (atm) Conversion
Pounds per square inch
Pounds per square inch (psi) is a unit of pressure defined as one pound-force per square inch (approximately 6,894.76 Pa). It is the standard for tyre pressure, hydraulic systems, and gas cylinders in the United States. Standard atmospheric pressure is approximately 14.696 psi. In engineering, gauge pressure (psig — relative to atmosphere) is distinguished from absolute pressure (psia — relative to a perfect vacuum), a distinction critical in thermodynamics and fluid system design.
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).
| Pounds per square inch (psi) | Atmospheres (atm) |
|---|---|
| 0.1 psi | 0.0068 atm |
| 1 psi | 0.068 atm |
| 2 psi | 0.1361 atm |
| 3 psi | 0.2041 atm |
| 5 psi | 0.3402 atm |
| 10 psi | 0.6805 atm |
| 20 psi | 1.3609 atm |
| 30 psi | 2.0414 atm |
| 50 psi | 3.4023 atm |
| 100 psi | 6.8046 atm |
| 1000 psi | 68.046 atm |
Frequently Asked Questions (FAQ)
How many atmospheres are in 1 pounds per square inch?
1 pounds per square inch (psi) is exactly 0.068046 atmospheres (atm).
How do I convert pounds per square inch to atmospheres?
Multiply the value in pounds per square inch by 0.068046 to get the result in atmospheres. Or use the converter above — type any number and see the result instantly.