Water with Ice
You have a glass of water and an ice cube floating in it. When the ice cube melts, will the water level increase, decrease or remain the same?
SOLUTION
It will remain the same. The amount of water that the ice cube displaces is equal to its mass. Since the mass does not change and the density of water is equal to 1, the extra water after melting will be the same amount as the displaced water before that.
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