quantity amount volume

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Poland Polish
Can these words be used interchangeably or are there any rules relating to their usage? Dictionaries don't help much. Which of these three words would best fit the following sentences?
  1. The ... (amount?) of water used for cleaning has decreased from 20 litres per washing to 10 litres.
  2. The line represents the ... (quantity?) and type of food babies require.
  3. The ... (volume?) of global trade in merchandise has been increasing rapidly.
  • Thomas Tompion

    Senior Member
    English - England
    At first sight, I think amount and quantity are interchangeable in the first two, because we talk about a quantity or amount of water and food.

    Trade is another matter: it's measured by volume or by value and we have to be clear which we are talking about.
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