# 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

**Pound Per Square Inch**(

*more accurately*:

**Pound-force Per Square Inch**, lbf/in²) is a unit of pressure or of stress based on avoirdupois units. It is the pressure resulting from a force of one pound-force applied to an area of one square inch.

## 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.