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To measure the density of anything, one must divide its mass by its volume. Finding the mass of a human is as easy as stepping on a set of scales, but finding the volume is a bit more tricky. The simplest way is to completely immerse the person in a tank of water, and measure how much the water level rises. This will let you calculate how much water was displaced--that amount is the person's volume. For example, if a person weighs 75kg, and displaces 65 liters of water, they'd have a density of about 1.15 (75/65= ~1.15)

If you're using pounds and gallons instead, you'll need to divide the result by 8, since a gallon of water weighs 8 lbs. So if a 165 lb. person displaces 18 gallons of water, they'd have a density of about 1.145 (165/18=~9.16, 9.16/8=~1.145)

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