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Percent by weight

Also mass percentage/percentage; see under volume percentage.

Unit of measurement for the proportion of a substance in the total volume of a mixture. If you mix 100 litres of ethanol with 100 litres of water, you get 192.75 litres of mixture; this phenomenon is called volume contraction. Since there are 100 litres of alcohol in this 192.75 litre mixture, 100 litres of mixture contain 51.8 litres of...

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