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. .
Probably not. It would freeze faster than hot water because the hot water has to lose more heat.
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.
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.
Because the particles in the cold water are slower than the particles in hot water and they become slower and slower until it freezes.
Because of things
Why is the second paragraph a contradiction of the first? If hot water pipes 'Absolutely' do not freeze faster than cold water pipes then why the comment about the cold water pipes having a larger diameter which causes them to freeze at a slower rate than the smaller hot water pipes? Also, the word then in the last line should be thanand there should be an a between usually and larger. And, piping should be changed to pipe.
Water will freeze faster than 7-up. This is due to the extra stuff in 7-up that isn't in water, such as sugars, syrups and caffeine.
If you have the same volume of both then there are in cold water more molecules.
Sugar sinks at the same rate in warm or cold water. Sugar dissolves faster in warm water.
No. The important factor is the surface area of the water that is exposed to cold conditions. A large, thin pan of water will freeze just as quickly as a smaller, thin pan of water if the ratio of surface area to volume is the same. The reason a large bottle of water freezes more slowly than a smaller one is that less of the water is exposed to the outside of the container, where its heat is lost. And, as the ice forms inside the container, it further reduces the rapidity of heat loss to the air around the container.
It has been proven that hot water freezes faster than cold water.
yes
Yes it does. Cold water freeze slower than normal or hot water.
Hot and cold water and a freezer and a timer or stopwatch
No. It takes longer to freeze because cold water is closer to it's freezing point.
The fact that hot water may freeze faster than cold is often called the Mpemba effect
Water will freeze faster than salt water.
Yes. Water of any starting temperature must be cooled to 0 oC in order to freeze.
no salt water does not freeze faster than sugar.
no because the cold water speeds up the process by starting it
Cold water will freeze faster. Because the freezing point of water is 0oC, water that is closer to that point will freeze faster then hot water. This is because it will require less time to lower the temperature to the freezing point.
I suppose that pure water freeze faster.