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From the metric system to SI: the seven base quantities and their units sheet
3-mark answer frame

What are base quantities? List the seven SI base quantities with their units and symbols.

How to lay out the answer. Follow the frame, then write it in your own words.

  1. 1 · Define. Base quantities are independent of one another; all other quantities are built from them.
  2. 2 · Length, mass, time. Length: metre (m); mass: kilogram (kg); time: second (s).
  3. 3 · Current and temperature. Electric current: ampere (A); thermodynamic temperature: kelvin (K).
  4. 4 · Substance and light. Amount of substance: mole (mol); luminous intensity: candela (cd).
  5. 5 · Daily life. We read body temperature in °C or °F; the SI unit is the kelvin (K = °C + 273.15).
  6. 6 · Close. So SI rests on seven base units, adopted in 1960.

Scoring tip: Write every unit with its symbol, and get the capitals right: K and A are capitals, kg and mol are not.