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Hot water may have more air in it, if you look closely you will see that there are all individual tiny, tiny little bubbles in there, looking at it as a whole, it looks white. If you notice it will clear from the bottom, up. Indicating that the bubbles are rising. I can say definitely it's air, but why there's more air in hot water than in cold water, that I couldn't say - maybe it has something to do with the molecules, their size and how fast they are moving. Hot water has the same amount of air in it as the cold because it is the same water. However the warmer the water the less disolved gases it can hold. Once liberated from being under pressure in the pipe and poured into a glass the gases come out of solution and into the air once this stops the water appears clear. It is much like opening a bottle of soda. The white colour may be hydrogen generated from inside the hot water unit. It is produced as a function of the water quality, temperature and the type of annode in the unit.

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Q: Why is hot water white but settles to clear in a glass?
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