# 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

**Millibar**is a metric unit of pressure equal to one-thousandth of a bar.

## 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.