Question

What are the 22 SI units?

Answer 1

The International System of Units (SI) consists of 7 base units, but there are also 22 derived units that are combinations of the base units. Here is a list of the 22 SI units, including both base and derived units:

7 Base SI Units:

1. Meter (m) – unit of length.
   

1. Kilogram (kg) – unit of mass.
   

1. Second (s) – unit of time.
   

1. Ampere (A) – unit of electric current.
   

1. Kelvin (K) – unit of temperature.
   

1. Mole (mol) – unit of the amount of substance.
   

1. Candela (cd) – unit of luminous intensity.
   

15 Derived SI Units:

These are derived from the base units through multiplication or division.

1. Radian (rad) – unit of angle.
   

1. Steradian (sr) – unit of solid angle.
   

1. Hertz (Hz) – unit of frequency (1 Hz = 1 s⁻¹).
   

1. Newton (N) – unit of force (1 N = 1 kg·m/s²).
   

1. Pascal (Pa) – unit of pressure (1 Pa = 1 N/m²).
   

1. Joule (J) – unit of energy (1 J = 1 N·m).
   

1. Watt (W) – unit of power (1 W = 1 J/s).
   

1. Coulomb (C) – unit of electric charge (1 C = 1 A·s).
   

1. Volt (V) – unit of electric potential (1 V = 1 J/C).
   

1. Ohm (Ω) – unit of electrical resistance (1 Ω = 1 V/A).
   

1. Farad (F) – unit of capacitance (1 F = 1 C/V).
   

1. Tesla (T) – unit of magnetic flux density (1 T = 1 Wb/m²).
   

1. Henry (H) – unit of inductance (1 H = 1 Wb/A·s).
   

1. Lumen (lm) – unit of luminous flux.
   

1. Lux (lx) – unit of illuminance (1 lx = 1 lm/m²).
   

These 22 units form the foundation for measuring physical quantities in science and engineering!