# What is *pressure*?

**Pressure**is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.

## Input

**Bar**is a metric unit of pressure, but not part of the SI units, defined as exactly equal to 100,000 Pa (100 kPa).

## Output

**Standard Atmosphere**is a unit of pressure defined as exactly 101,325 Pa (1.01325 bar). It is the current average atmospheric pressure on Earth at sea level that is sometimes used as a reference pressure or standard pressure.