Based and Derived Quantities and their SI Units
Based Quantities and their SI Units
- Length: The metric for distance between two points. The SI unit, Metres (m), represents this.
- Mass: A measure of the amount of matter within a body. The SI unit, Kilogram (kg), signifies this.
- Time: The ongoing sequence of events. The SI unit, Seconds (s), denotes it.
- Electric Current: Measures the rate of flow of charge in a circuit. The SI unit, Ampere (A), establishes this.
- Thermodynamic Temperature: A scalar measure of hotness and coldness. The SI unit, Kelvin (K), corresponds to this.
- Amount of Substance: The quantity of matter measured by the number of atoms or molecules. This is denoted by the SI unit Mol (mol).
- Luminous Intensity: The amount of light emitted in a particular direction. The SI unit, Candela (cd), illustrates this.
Derived Quantities and their SI Units
- Area: Derived from the square of the base unit length (Metres). Si unit - Square Metre (m²).
- Volume: A derived unit from cube of length (Metres). SI unit - Cubic Metre (m³).
- Speed/Velocity: Derived from distance over time. SI unit - Metre per Second (m/s).
- Acceleration: The rate of change of velocity. SI unit - Metre Per Second Squared (m/s²).
- Force: Mass multiplied by acceleration, from Newton's second law of motion. SI unit - Newton (N).
- Pressure: Force per unit area. SI unit - Pascal (Pa).
- Energy: The capacity to do work. SI unit - Joule (J).
- Power: The rate of doing work or the rate of transfer of energy. SI unit - Watt (W).
- Frequency: The number of occurrences of a repeating event per unit of time. SI unit - Hertz (Hz).
- Electric Charge: Process of electric current for a period of time. SI unit - Coulomb (C).