A derived unit is a unit of measurement formed by combining one or more of the seven fundamental base units in the International System of Units (SI). Examples of derived units include the newton (N) for force, pascal (Pa) for pressure, joule (J) for energy, hertz (Hz) for frequency, and coulomb (C) for electric charge. Derived units are typically expressed as products or ratios of base units, such as meters per second (m/s) for velocity or kilogram per cubic meter (kg/m³) for density. Some have special names and symbols, often named after scientists (e.g., newton, joule, watt). In summary, derived units are not basic units like meter, kilogram, or second, but instead are obtained by combining these base units. For example:
- Newton (N) = kg·m/s² (force)
- Pascal (Pa) = N/m² = kg/(m·s²) (pressure)
- Joule (J) = N·m = kg·m²/s² (energy)
These are all derived units.
