Size properties that cover a portion of space in 1, 2 and 3 dimensions. Length is the space straight between two positions. Sweep out the space from each point along a length to have area. Sweep out the space from each point of an area to have volume.
- Scalar properties derived from position
- Symbols: $L$, $A$ and $V$
- SI-units: metre $\mathrm m$, square metre $\mathrm m^2$ and cubic metre $\mathrm m^3$