| |
|
|
| |
 |
| Four Categories of Physical Quantities |
|
| Based on dimensions, physical quantity can be classified under four categories. |
| |
 Dimensional constants |
| |
| E.g., gravitational constant (G), Planck's constant (h) and velocity of light (c) |
| |
| Their values are always constant. |
| |
 Non-dimensional constants |
| |
| The constants having no dimensions. |
| |
| E.g., p, e, 1, 2,3 ………….etc. |
| |
 Dimensionless variables |
| |
| Angle, specific gravity, strain etc., do not have any dimensions and any constant value and hence, are variables. |
| |
 Dimensional variable |
| |
| Velocity, acceleration, density, area, volume, force, etc., have no constant value, but have dimensions. |
| |
|
|
| |
|
|
| |
|
|
|
