The International System of Units (abbreviated SI from “systeme internationale “, the French version of the name) is a scientific method of expressing the magnitudes or quantities of important natural phenomena. There are seven base units in the system, from which other units are derived, as follows:
Property | Unit |
Length | metre (m) |
Mass | kilogram (kg) |
Time | Second (s) |
Electrical current | ampere (A) |
Thermodynamic temperature | kelvin (K) |
Amount of substance | mole |
Luminous intensity | Candela |
The derived units most ikmportantfor hydro production as are follows:
Property | Unit |
Force, F | Newton (N) |
Work | Joule (J) |
Power, P | Watt (W) |
Energy, E | kiloWatt-hour (kW-h) |
Velocity, v | m/s |
Area, A | m² |
Flow, Q | m³/s |