This is an unquestionable reality, proven several times. Try it.
2006-09-12 04:52:07 · 11 answers · asked by roshpi 3 in Science & Mathematics ➔ Physics
I've tried, but it seems like the water just won't freeze right with the freezer door open for an hour, or more. I guess i could try putting a video recorder in there the next time.
How did you prove it?!
2006-09-12 05:52:25 · answer #1 · answered by angela 3 · 0⤊ 0⤋
ording to Jonathan Katz of the University of Washington at St Louis, it's all to do with solutes. "You have to ask yourself: what does heating do to water that makes it easier to freeze?" he says. "The answer is that it precipitates out solutes."
The solutes Katz has in mind are calcium and magnesium bicarbonate, which make most drinking water "hard". When the water is heated, these precipitate out to form the solid scale that "furs" up the inside of a kettle.
Water that has never been heated still contains these solutes. As it freezes, ice crystals form, and the concentration of solutes in the remaining water becomes ever higher up to 50 times as high as normal. This lowers the freezing point of the water, just like salt sprinkled on a road in winter. "The water therefore has to cool further before it freezes," says Katz.
2006-09-12 05:03:48 · answer #2 · answered by Muskratbyte 3 · 2⤊ 1⤋
Conventional wisdom says because the higher the temperature difference the faster the temperature transfer. Sounds logical doesn't it?
Try boiling water in one sample and letting it cool overnight to the same ambient temperature as an unboilled sample and then test it - mysterious isn't it?
2006-09-12 04:58:01 · answer #3 · answered by Anonymous · 1⤊ 0⤋
Because the atoms in warm water are moving faste than in cold water, thusly they distribute the cooling temperature faster.
2006-09-12 04:53:51 · answer #4 · answered by c.arsenault 5 · 1⤊ 0⤋
i love utilising lukewarm water reason i am going to stay contained in the bathtub longer with my transportable dvd participant and a bottle of wine with some bubbles. besides you may continuously upload some warm water to it even as it receives chilly.
2016-11-26 19:43:51 · answer #5 · answered by ? 4 · 0⤊ 0⤋
Water that has been boiled recently will freeze faster than water that has not; this is because the boiled water has expelled the dissolved gases, and these gases slow the freezing process of regular tap water.
2006-09-12 05:28:09 · answer #6 · answered by poorcocoboiboi 6 · 0⤊ 1⤋
Warm water evaporates faster than cold, so there is less warm water remaining to freeze.
2006-09-12 05:45:15 · answer #7 · answered by mathematician 7 · 1⤊ 0⤋
water needs most of the air to escape befor it can freeze so warm water can release the air faster thus allowing it to freeze sooner
2006-09-12 04:54:49 · answer #8 · answered by ransom53 2 · 1⤊ 0⤋
It's true and it has been explained, it's because of the evaporation effect in the cold. Read this:
http://www.sciam.com/askexpert_question.cfm?articleID=0008EB6B-6C7E-1C71-9EB7809EC588F2D7
2006-09-12 04:55:33 · answer #9 · answered by flammable 5 · 2⤊ 0⤋
speed of the molecules
2006-09-12 04:54:05 · answer #10 · answered by Frank 6 · 1⤊ 0⤋