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Water, like most other materials, expands when heated so cold water is denser than hot water and is therefore heavier, assuming the quantities are identical of course. This is why the top of a water heated radiator warms up before the bottom; the warmer water 'floats' on top of the colder water. the same effect is sometimes very evident while swimming in a calm sea or lake, the warmer water being close to the surface.
Simply heating any quantity of water, however, will not increase or decrease its weight.
From: Southern California High Desert, here and there....
RE: Interesting Facts
ORIGINAL: HD7585
If water expands when heated,Why does ice in your pipes expand to burst the pipe?
Liquid water is at its maximum density at 3.98 degrees C. It will expand if either heated, or cooled, from that temperature, but not as much as when it freezes, at which point the water molecules form a lattice structure.
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