# 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

**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.