in order to cool something you cannot add cold, you can only remove heat.
in order to freeze water, you must remove enough calories of heat energy from the water to bring it to 0 degrees celsius( 32 degrees fahrenheit)
one calorie is the unit which increases the temperature of one gram (one cubic centimeter of water) of water by one degree celsius.
so to answer the question it depends how quickly your cooling apparatus is removing the heat. you could theoretically freeze hot water as quickly as cold water if you used a better freezer on the hot water or put it in a colder place. If the location is constant for the hot water and the cold water, and they are being cooled at the same rate, then the cold water will freeze faster.
When I'm going to make pasta on my stove, I take 190 degree water from the instant hot water tap and then put that on the stove, it boils much quicker than if I had put the cool tap water in the pot on the stove. same concept
It loses heat faster, and its temperature drops faster,
but it takes more time to become solid.
Cold air and hot water makes water freeze faster simply because the hot water is steaming and so the result is that there is less water to freeze. hot water = steam = less water less water = faster freeze cold air = faster freeze
cold water
Cold water freezes faster because hot water has to cool down to the freezing temperature before it can freeze.
It has been proven that hot water freezes faster than cold water.
Kinetic energy
Hot and cold water and a freezer and a timer or stopwatch
Cold water, being the closest to freezing point, will obviously freeze the fastest. Hot water will freeze the second fastest, and salt water barely ever freezes, except in very cold conditions.
The fact that hot water may freeze faster than cold is often called the Mpemba effect
I believe hot water freezes faster because it is supercooled. Cold water is non-supercooled. When cold water freezes ice crystals form and float to the top, forming a layer of ice over the top of the water, so the layer of ice stops evaporation . While the hot water, which is probably no longer hot in the freezer,when it does freeze, it freezes throughout, creating more or less of a slush before freezing solid.
No. It takes longer to freeze because cold water is closer to it's freezing point.
cold water is best because it will freeze faster
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.