Why does hot water freeze faster than cold water?

Answer 1

Two small identical containers (ice cube trays, for example) with equal volumes of water are placed in a freezer - the only difference is one container holds hot water, and the other one holds cold water. The container that holds hot water freezes first. Why? . It is a misconception that hot water freezes sooner than cold water because of the rate of cooling alone. It is true that, at first, the hot water cools at a much more rapid rate than the cool water, due to the larger temperature differential of the hot water container. But as the hot water container reaches the same temperature as the cold water container, the temperature differentials become the same, and from that point on, both containers will cool at the same rate. But remember that the cold water container was cooling too (just not as quickly), so it will always have a head start, and the hot water should never be able to catch up to the cold water before the cold water freezes. So there must be something else going on than just cooling to enable the hot water to freeze before the cold water. . The high temperature differential with the hot water leads to something beyond just cooling. Hot water evaporates much more quickly in a freezer than cold water does. So by the time the hot water cools to the same temperature as the cold water, there is muchless water in the hot water container than water in the cold water container. Now that they are the same temperature, they both should evaporate and cool at the same rate, so it is just a race to which one freezes first. But with less water in its container, the (formerly) hot water has a higher surface area to volume ratio than the (originally) cool water. The higher surface area to volume ratio means the heat escapes more quickly (it cools more rapidly) from the (formerly) hot water. It is this higher surface area to volume ratio, cased by the lower volume of water due to evaporation, that causes the (originally) hot water to freeze first. . To prove this, conduct the following experiment. .

1. Place two identical ice trays in the freezer - one filled with hot water, and one filled with cold water. The hot water tray will freeze first, but you will notice that there is much less ice left in each ice cube in the hot water ice tray.
2. Now repeat the exact same experiment, but this time seal both the hot water ice tray and the cold water ice tray with plastic cling wrap to prevent the water from evaporating. Now the cold water ice tray will freeze before the hot water ice tray, and both trays will have equal amounts of ice.

Probably not. It would freeze faster than hot water because the hot water has to lose more heat.

Answer 2

Known as the Mpemba Effect after the one who bought it to modern notice.

Yet too be explained satisfactorily, but much experimented.

Archimedes knew that to have some water freeze soonest, it should be sun-warmed first.

The optimum temperatures for your two glasses of water is 35oC and 5oC.

Place each glass on an insulating mat in the freezer, and proceed.

Answer 3

Actually hot water freezes faster then cold water this is known as the Mpemba effect. The effect was first observed by Aristotle in the 4th century BC.

Answer 4

Because the particles in the cold water are slower than the particles in hot water and they become slower and slower until it freezes.

Answer 5

Because of things