Why are liquids not mostly measured in weight or mass?
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Because the density of liquids is not commonly known and not the same from liquid to liquid. Density is the mass or weight per a given volume.
More simply, 1 gallon of water does not weigh the same as a gallon of oil, nor the same as a gallon of gas. Their mass or weight would all be different. This is why it is simpler to use Volume, which is always constant no matter what liquid is used.
If I ask for a gallon of water, or a gallon of oil, or a gallon of gas they all have the same volume but each of their weights would all be different. But you would still be able to bring each one of those in a 1 gallon jug.
If I ask for 1 pound of water or 1 pound of oil or 1 pound of gas, there would be no easy way to figure out how large of a jug would be needed to transport those, since they will all be different amounts. They would all need different size jugs to transport.
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