Pressure

Atmosphere (symbol: atm) is the pressure exerted by the weight of air in the atmosphere acting on 1 square centimeter and is defined as being equal to 101325 Pa. It is sometimes used as a reference pressure or standard pressure. It is approximately equal to Earth's average atmospheric pressure at sea level.

Kilogram force per square meter is the pressure exterted by one kilogram force being applied to an area of one square meter. One kilogram per square meter is equal to 98.0665 pascals. It is a non-SI metric unit for pressure.