Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
Definition
Atmospheres (atm) are units commonly used to express atmospheric or air pressures. One atmosphere is approximately equal to the average air pressure at sea level on Earth.
Related terms
Torr: Torr is another unit used to measure pressure, where 1 atm is equal to approximately 760 torr.
Pascal (Pa): Pascal is the SI unit for pressure, and 1 atm is approximately equal to 101325 Pa.
Millimeters of Mercury (mmHg): Millimeters of mercury are units commonly used in medicine to measure blood pressure. 1 atm is approximately equal to 760 mmHg.