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Unformatted text preview: its volume. If you increase the volume of an object, but keep the mass the same, the object's density decreases. Now we know that air is lighter than water. When you take a deep breath and hold it, you are increasing your volume, but your mass is only going up a little bit (imagine it this way: you are adding air, which is very light, to your mass, so your average mass is going down). This has the effect of decreasing your density, making it easier to float. If you let the air out, your density increases again and you sink a bit. Also, fat has a low density, so very skinny or very muscular people will have a higher density on average than people with more body fat. They will tend to sink easier....
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 Spring '08
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 Math, Calculus

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