Quote:
Originally Posted by Burning Down
(...) but what if it's not water? Or if it's something denser/less dense than water?
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The liquids we know in our daily life (water, milk, juices, wine, beverages, etc.) have a similar density. Unless you are a chemist, you don't need a high precision. We usually see small volumes. So, for instance, a litre of milk weights practically a kilo. Obviously, we are not talking about industrial quantities.