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A pot of cold water has a certain amount of dissolved oxygen. If you boil the water the oxygen will leave the water (bubbles in a boiling pot). Based on that I would have thought that a pot of hot water would be lighter than a pot of cold water.
Paul Anderson asked the Naked Scientists: I was listening to one of your podcasts yesterday in which the question was: "Which is heavier, a pot of cold water or a pot of hot water?",
...I find it so easy to do arithmetic with modern aids like calculators and BASIC programs.
What do you think?