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The International System of Units (generally referred to as the "SI") is the system of units of measurement, based on the metric system adopted in France in 1791. The SI base units are:

  • Length: metre/meter (m)
  • Mass: kilogram (kg)
  • Time: second (s)
  • Electric current: ampere (A)
  • Temperature: kelvin (K)
  • Luminous intensity: candela (CD)
  • Amount of substance: mole (mol)

All other units are derived from those seven. They include:

  • Frequency: hertz (Hz)
  • Angle: radian (rad)
  • Force: newton (N)
  • Pressure: pascal (Pa)
  • Energy: joule (J)
  • Power: watt (W)
  • Electric potential: volt (V)
  • Electric charge: coulomb (C)
  • Capacitance: farad (F)
  • Inductance: Henry (H)
  • Resistance: ohm (Ω)
  • Magnetic flux: weber (Wb)
  • Magnetic field strength: tesla (T)
  • Electric conductance: siemens (S)
  • Solid angle: steradian (sr)
  • Temperature: Celsius (°C)
  • Luminous flux: lumen (lm)
  • Illuminance: lux (lx)
  • Radioactivity: becquerel (Bq)
  • Adsorbed dose of ionizing radiation: gray (Gy)
  • Equivalent dose of ionizing radiation: sievert (SV)
  • Catalytic activity: katal (kat)
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Q: What are the metric units?
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