It seems to me that hot water has to lose heat until it reaches 32F (0 Celsius) before it begins to freeze. The only logical explanation I can think of is if two identical metal ice cube trays were filled with hot water in one and cold water in the other and placed in a freezer that had a layer of frost on top of the coils the tray with hot water would melt the frost and the metal tray would get better surface contact with the coils while the tray with cold water would sit on top of the frost which would be like an insulator. Any comments?
2006-08-28 17:19:02 · 10 answers · asked by ballard770 2 in Science & Mathematics ➔ Physics
im not sure y but i heard that too about a decade ago, and a few friends and i put it to the test
we soaked a couple of wash clothes with hot and cold water and froze them
the one with the hot water was actually frozen faster than the cold water one
dont ask how that worked cause i still dont kno
2006-08-28 17:26:05 · answer #1 · answered by fuzzycakes 5 · 1⤊ 1⤋
Well, so many other answers. In my training for nuclear power in the Navy, we learned a LOT of things about heat and thermal energy. This question came up regarding thermal energy in a fluid, water. It seems the heated water DOES freeze faster, but not because of the initial temperature but from dissolved gasses in solution. It takes more energy to remove the gasses from cold water than from hot water because the heat which heated the water drove off a lot of the dissolved gasses. Hence, the hot water gets a head start by not requiring as much energy loss per pound as the cold water to start freezing. I know, it doesn't seem logical, but by removing a sizeable sink for energy, the removal of the dissolved gasses, the hot water actually gains overall advantage on heat loss required to start freezing.
2006-08-28 18:05:43 · answer #2 · answered by rowlfe 7 · 1⤊ 0⤋
Temperature changes occur along a logarithmic function. what this means is that the farther away from the abient temperature an object is the greater the rate of change in the temp. The closer the temp of the object the slower the change in temp. What this means is that the hot water will lose temperature faster initially but once it reaches the same initial temp as the cold water it will cool along the same curve as the cold water.
2006-08-28 17:45:35 · answer #3 · answered by nathanael_beal 4 · 1⤊ 1⤋
For two reasons:
1) The hot water will have a higher lead (or other metallic) ionic content, which has the ability to give off heat faster.
2) For water to freeze, it must first expel its oxygen molecules in suspension ( which is why water expands as it freezes ). Hot water has fewer of these molecules.
2006-08-28 18:45:51 · answer #4 · answered by spyguy 3 · 0⤊ 1⤋
it is genuine, in some specific, fastidiously controlled situations, warmer water freezes swifter than chillier water. it is because of the fact the get away of heat of evaporation would reason the warmer water to lose its warmth and crystalize in the present day. It is going from being a liquid to stable at as quickly as. Take a cup of boiling water outdoors in Antarctica, throw it interior the air, and it will hit the floor as ice. Take a 2d cup of 40 degree F water, do the comparable, and it will nevertheless be water while it hits the floor.
2016-10-01 00:56:04 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Water can only freeze when it is at 32F or 0C therefore if you can drop the temperature of hot water to 32F before cold water to 32F it will freeze faster.
Water molecules when frozen tend to attract their polar opposites (H from one water molecule to an O of another water molecule) which is why water expands when frozen.
Warmer water allows water molecules to mobilize until frozen and colder water is more dense preventing mobilization therefore hindering it to become a solid but can only freeze as the temp decreases.
2006-08-28 19:00:48 · answer #6 · answered by Shahn 2 · 0⤊ 1⤋
The phenomenon that hot water may freeze faster than cold is often called the Mpemba effect. See the site listed below for details.
2006-08-28 17:25:47 · answer #7 · answered by ted_armentrout 5 · 0⤊ 1⤋
Wrong, Water that has been heated before will freeze faster. but hot water itself will not freeze faster.
2006-08-28 17:24:48 · answer #8 · answered by myothernewname 6 · 0⤊ 1⤋
Its called the Mpemba effect and it only occurs under very specific sets of conditions and is still not completely understood.
You can read about it here:
http://math.ucr.edu/home/baez/physics/General/hot_water.html
2006-08-28 17:24:52 · answer #9 · answered by Anonymous · 1⤊ 0⤋
I think it's a load of malarkey.
2006-08-28 18:35:53 · answer #10 · answered by Anonymous · 0⤊ 3⤋