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Suppose a recipe calls for measuring out 500
grams of sugar.
-- The _substance_ being measured is sugar.
-- The _quantity_ being measured is 500 grams.
-- The _unit_ of measurement is 1 gram,
Isn't the quantity to be measured the mass?
The measurement is 500 g.
Many students will say they are going to measure the grams of the
sugar when they should be saying they are measuring the mass.
(Actually they say they are weighing it but that is another story.)