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Water is made of tiny pieces called molecules. Heat makes molecules excited. They jump around and move quickly! They need space to do this. Cold, on the other hand, makes molecules slow down and it can make them nearly stop. They don't need as much room to move around and the space between them shrinks! It would seem that cold water would have to be denser than warm water.

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11y ago
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13y ago

cold water is more dense than hot water, therefore making it heavier.

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13y ago

Neither.

Technically hot water is heavier, according to quantum physics and string theory, but for practical purposes, they weigh exactly the same.

hot water is less dense.

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Q: Which is heavier cold or hot water?
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