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SI Base Units

Physics: AQA A Level, topic 1.1.1

SI Base Units

SI base units are the standard units used to describe physical quantities in physics. They are:

Metre (m)

Metre (m)

  • The SI unit for distance (length).
Kilogram (kg)

Kilogram (kg)

  • The SI unit for mass.
Second (s)

Second (s)

  • The SI unit for time.
Ampere (A)

Ampere (A)

  • The SI unit for electric current.
Kelvin (K)

Kelvin (K)

  • The SI unit for temperature.
Mole (mol)

Mole (mol)

  • The SI unit for chemical mass.
Candela (cd)

Candela (cd)

  • The SI unit for luminous intensity.

Test yourself on SI Base Units

  • Which of these is the SI unit for time?

  • Which of these are SI base units?

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