You have probably heard someone say that hot water freezes

Chapter 11, Problem 11.71

(choose chapter or problem)

You have probably heard someone say that hot water freezes faster than cold water. Is this an urban legend or is it true? To test this hypothesis, ll one container with hot water, at about 200F, and another with cooler water, at about 70F. Place the two containers in the freezer compartment of a refrigerator, and nd out for yourself. There are a number of variables that you need to attempt to control in such an experiment: (1) The two containers need to be placed at similar locations in the freezer compartment. That is, one should not be near the door while the other is in the back of the compartment. (2) The two containers should not be placed close together, or an unwanted exchange of energy will take place between them. (3) If the freezer is one of the old types that forms frost on its walls, the hot container should not be allowed to melt through the frost and make intimate contact with the cold walls of the freezer. Can you list any more variables that you need to control?