Answer:
Using celsius water freezes at 0, and water boils at 100.
Explanation: That is the purpose of the celsius scale to measure between those two points.
It needs at least 4 hours to grow to cause illness :)
Answer:
If the water is initially hot, cooled water at the bottom is denser than the hot water at the top, so no convection will occur and the bottom part will start freezing while the top is still warm. This effect, combined with the evaporation effect, may make hot water freeze faster than cold water in some cases.
Explanation: