^General
^General
| QUANTITY | SYMBOL | DEFINITION/RELATION | SI UNITS | DIMENSIONS |
| Mass | M or m | Also called inertia. | kg | [M] |
| Area | A or S | Region bounded by lines or curves in 2D. | M2 | [L2] |
| Volume | V | Space bounded by lines or curves in 3d. | m3 | [L3] |
| Density | r | Mass per unit volume | kg m – 3 | [ML – 3] |
| Linear density | m | Mass per unit length | kg m – 1 | [ML – 1] |
| Surface density | s | Mass per unit area | kg m – 2 | [ML – 2] |
| Specific volume | 1/r | Volume per unit mass | kg – 1 m 3 | [M – 1 L3] |
| Number density | n | Number of particles per unit volume. | m– 3 | [L– 3] |
| Specific gravity Or relative density | SG | density of body /density of water at 4 0C | no units | no dimensions |
