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Measures of volume (milliliters) and mass (milligrams) are different. Your 25 milligrams of Orange Juice is about 25 milliliters of orange juice, but only because 25 milligrams of water equals 25 milliliters of water, and that's about as good as it gets. If you have 25 milligrams of Mercury, that amazing liquid metal, you will have a lot less than 25 milliliters because mercuty is over 13 times as dense as water. See the problem? A gallon of water weighs more than a gallon of gasoline, and a gallon of liquid mercury weights much, much more than either the water or gasoline.

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16y ago

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