[spacetime_cmplx]

No, water is most dense at 4°C. If you take water at 2°C and increase its temperature by a degree, it will _compress_, not expand. But if you take water at 10°C and heat it by a degree it will expand. My question is what percentage of the expansion is offset by the compression.

(Note that the 4°C number is only for pure water.)

> water still weights the same

Weight has nothing to do with my first point. It's the increase in volume that spills into land.

[marcosdumay]

Yeah, my comment was stupidly about how some other phenomenon doesn't exist.

But well, water being water, I imagine this doesn't happen at pressure; just for surface water. Is that the case?