This is from my child's science experiment. The results actually are quit good.
2007-01-19 13:13:40 · 9 answers · asked by lucy 2 in Science & Mathematics ➔ Other - Science
Cold water freezes faster than hot water.
2007-01-19 15:23:23 · answer #1 · answered by alex 1 · 0⤊ 0⤋
In theory, cold water freezes faster because the same amount of heat per minute is available and the hot water has to be brought down to freezing first.
In the real world, the cold water may layer and supercool below freezing without forming ice, while the hot water has circulation and thus keeps mixing, forming ice sooner in time.
If both were stirred gently, I would expect the cold water to start showing ice crystals while the hot is still is above 32F.
2007-01-19 13:20:32 · answer #2 · answered by Mike1942f 7 · 1⤊ 0⤋
The freezing point of water is lowered depending upon the amount of dissolved solids. Most water contains different salts, so it is possible for it to freeze at a temperature slightly less than the normal freezing point of 0C, or 32 F. Calcium carbonate can be found in many fresh waters, and it is the material that scales up your water heater. In doing so, it is removed from the hot water, perhaps along with some other salts, and so the hot water may have lower dissolved solids content than the cold water.
Calcium carbonate is interesting because it's solubility in water actually decreases with increasing temperature. In most cases, solubility of solids increase with increasing temperature.
2007-01-19 13:39:00 · answer #3 · answered by LJMan 2 · 0⤊ 1⤋
Cold water freezes faster than hot, I've tried it and it's so.
2007-01-19 13:28:14 · answer #4 · answered by Ruff 2 · 0⤊ 0⤋
Cold
2007-01-19 15:50:12 · answer #5 · answered by Scott S 4 · 0⤊ 0⤋
hot water will freeze faster than cold water.
2007-01-19 13:18:16 · answer #6 · answered by Dale D 2 · 0⤊ 0⤋
Cold!
2007-01-22 04:19:58 · answer #7 · answered by Billy Butthead 7 · 0⤊ 0⤋
ok. under certain circumstances hotter water can cool faster than cooler water. it is called the mpemba effect. of course if the water in one cup is drastically hotter than the other, the coller one will freeze first, so use common sense. here is a link explaining in more detail.
http://math.ucr.edu/home/baez/physics/General/hot_water.html#Morehttp://math.ucr.edu/home/baez/physics/General/hot_water.html#More
2007-01-19 13:24:51 · answer #8 · answered by lyrathefairie 3 · 0⤊ 0⤋
wow i did an experiment like that. actually i think its cold water.
evidence:
http://www.physlink.com/education/AskExperts/ae7.cfm
2007-01-19 13:25:00 · answer #9 · answered by skateKad47 3 · 0⤊ 0⤋