In this article, let us see key definitions, equations and formulas related to Units and Dimensions. These will also help you in preparing for competitive exams like JEE and NEET.
Index
Unit
Any physical quantity is measured in terms of an internationally recognized basic standard known as a unit.
Fundamental Units
| Physical Quantity | SI Unit | Symbol |
| Length | Metre | m |
| Mass | Kilogram | Kg |
| Time | Second | S |
| Electric Current | Ampere | A |
| Temperature | Kelvin | K |
| Luminous Intensity | Candela | Cd |
| Amount of Substance | Mole | mol |
Supplementary Units
| Physical Quantity | SI Unit | Symbol |
| Plane Angle | radian | r |
| Solid Angle | Steradian | Sr |
Metric Prefixes
| Prefix | Symbol | Value |
| Centi | c | \(10^-2\) |
| Mili | m | \(10^-3\) |
| Micro | μ | \(10^-6\) |
| Nano | n | \(10^-9\) |
| Pico | p | \(10^-12\) |
| Kilo | K | \(10^3\) |
| Mega | M | \(10^6\) |
