The Math Meridian
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Mass and capacity

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Learn it Mass: grams (g) for light things, kilograms (kg) for heavy things; 1 kg = 1,000 g. Capacity: millilitres (mL) for small amounts, litres (L) for big amounts; 1 L = 1,000 mL.

Example: Which unit for a bag of flour: g or kg? How many grams is 2 kg?

  1. A bag of flour is heavy, so use kg.
  2. 1 kg = 1,000 g.
  3. 2 kg = $2 \times 1{,}000$ = 2,000 g.

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