# Definition:Displacement

## Definition

The (physical) displacement of a body is a measure of its position relative to a given point of reference in a particular frame of reference.

Displacement is a vector quantity, so it specifies a magnitude and direction from the point of reference.

In Cartesian coordinates, the direction is implicit, as it occurs as a result of the combined distances from the various axes of the frame of reference.

### Dimension

The dimension of displacement is length $L$.

### SI

The SI unit of displacement is the metre.

### CGS

The CGS unit of displacement is the centimetre $\mathrm {cm}$.

### FPS

The FPS unit of displacement is the foot $\mathrm f$.

## Also known as

The displacement of a body is also known as its position vector.