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Well, it does NOT. Because hot water has to cool down first from 45-100oC back to 0oC and cold water only from 15-5oC back to 0oC. This means that 3 to 20 times more energy (heat) has to be transferred to a cooling agent (of less than 0oC).
In practice however a lot of disturbing influences might occur. Even for the socalled Mpemba Effect there is no scientific explanation at all, though the observation has been verified.
A2. But just before you shut your mind, check out Mpemba Effect in Wiki.
And to round out your thermodynamics, try Leidenfrost Effect, where a low pressure boiler evaporates water faster than a high pressure one.
A3? Now! I don't actually understand HOW this happens...But!...It DOES happen! Today is 1-23-11...it was 4 Degrees F this morning. I woke to find the HOT water to my washer frozen BUT! NOT the cold? That is the 2nd time this week that this has happened! Back when I was in high school taking chemistry, me and my dad argued over this question more than once...I KNEW it couldn't be possible! But! now...over 40 years later...I have to admit...I've seen this happen DOZENS of times!?!?! Here's the conditions that this occurred...maybe this will inspire someone to figure it out...I would sure like to know the answer!
CONDITIONS: I have 2 x 1/2" PCVC lines about 35' long ran from the source (Hot & Cold) inside of a gray dense foam tube. All joints are sealed with Duct Tape. Several feet of both ends, source & where it goes up through the floor to the washer are also wrapped with fiberglass insulation and then covered with reflectix (Foil covered bubble wrap). That leaves 20' - 25' that is just in the foam tube. I thought that by running the hot & cold together in one insulated tube instead of insulating them separately would keep it warmer inside the tube to help keep things from freezing! I woke up to 4 Deg. F and Frozen hot but not cold?!?!
Rhett Strosin
Wiki User
∙ 10y agoNo, simply because warmer water has a greater heat to give up, to achieve freezing than colder water. We are, of course, using the same conditions for each example--no added insulation for one case, no increased freezing air circulation, changes in atmospheric pressure, kinetic agitation, etc.
On average, it takes one BTU of heat energy to cause one pound of water to change its temperature by one degree. One BTU lost by one pound of water results in a one-degree drop (more or less) as you move from warmer water temperatures to colder.
Once you reach a water temperature of 32 degrees, a different physical property comes into play -- heat of fusion, or the amount of heat which must be transferred away from the water to cause it to change state from 32 degree water to 32 degree ice. That amount is a constant 144 BTU per pound of water.
While warmer water will initially lose heat at a faster rate to frigid air than cooler water, it by no means will race to freezing faster than water which has already been given a thermal "head-start" at a lower temperature.
Wiki User
∙ 15y agoThis almost seems like a no-brainer. If you start with warm and cold water, the cold water will freeze faster since the warm water will have to be cooled first. However, if the water is sitting in pipes (i.i. water pipes under a trailer for example) the hot water pipes will freeze first if neither is used since they will both achieve the ambient air temperature. This is because the heating of the water will release some of the dissolved gases which would otherwise cause the water to freeze at a very slightly lower temperature. At least this was what I was taught in Science class years ago. (A friend I lived with years ago thought he could make ice faster by using warm water, but he only understood part of this and I had to prove to him that it was the other way around.)
Wiki User
∙ 13y agoNo. An old wives tale.
What you may have heard about is the Mpemba effect which has merit based on the application for which it was noted but for regular household experiments, cold water freezes faster than hot.
Wiki User
∙ 8y agoWiki User
∙ 12y agoWell, it does NOT. Because hot water has to cool down first from 45-100oC back to 0oC and cold water only from 15-5oC back to 0oC. This means that 3 to 20 times more energy (heat) has to be transferred to a cooling agent (of less than 0oC).
In practice however a lot of disturbing influences might occur. Even for the so-called Mpemba Effect there is no scientific explanation at all, though the observation has been verified. The (wikipedia) article gives the optimal conditions for the experiment.
Wiki User
∙ 12y agoWell, it does NOT. Because hot water has to cool down first from 45-100oC back to 0oC and cold water only from 15-5oC back to 0oC. This means that 3 to 20 times more energy (heat) has to be transferred to a cooling agent (of less than 0oC).
In practice however a lot of disturbing influences might occur. Even for the socalled Mpemba Effect there is no scientific explanation at all, though the observation has been verified.
A2. But just before you shut your mind, check out Mpemba Effect in Wiki.
And to round out your thermodynamics, try Leidenfrost Effect, where a low pressure boiler evaporates water faster than a high pressure one.
A3? Now! I don't actually understand HOW this happens...But!...It DOES happen! Today is 1-23-11...it was 4 Degrees F this morning. I woke to find the HOT water to my washer frozen BUT! NOT the cold? That is the 2nd time this week that this has happened! Back when I was in high school taking chemistry, me and my dad argued over this question more than once...I KNEW it couldn't be possible! But! now...over 40 years later...I have to admit...I've seen this happen DOZENS of times!?!?! Here's the conditions that this occurred...maybe this will inspire someone to figure it out...I would sure like to know the answer!
CONDITIONS: I have 2 x 1/2" PCVC lines about 35' long ran from the source (Hot & Cold) inside of a gray dense foam tube. All joints are sealed with Duct Tape. Several feet of both ends, source & where it goes up through the floor to the washer are also wrapped with fiberglass insulation and then covered with reflectix (Foil covered bubble wrap). That leaves 20' - 25' that is just in the foam tube. I thought that by running the hot & cold together in one insulated tube instead of insulating them separately would keep it warmer inside the tube to help keep things from freezing! I woke up to 4 Deg. F and Frozen hot but not cold?!?!
Wiki User
∙ 9y agoWarm water does not freeze before cold water. This is simply a myth. The cooler the water, the less time it takes to cool down and freeze.
Wiki User
∙ 14y agono because it takes longer for the molecules to slow down in hot water
Wiki User
∙ 15y agoIt's an old wives' tale. Colder water freezes first. All else being equal. The warmer water has more heat energy to be removed.
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Does cool water freeze faster than warm water?
Absolutely. Water must achieve a temperature below 32°F before it can freeze. The closer the water is to room temperature, the quicker it will freeze. There is a phenomenon in which warm water freezes and cold water not: In some regions(e.g. Siberia) it is possoble to pour boiling hot water to the ground and it will freeze even before it hits the bottom. This is possible as hot water's molecules are moving more heavily than those of cold water. Therefore the surface of the water is bigger and warmth can leave the molecules faster. I remember a report of a experiment at one of the university's found hot water froze faster by a inute.
Data of does warm water freeze faster than cold water?
AnswerHot water doesn't freeze fasterAccording to www.sciensational.com, hot water freezes faster than cold water.But I do not have any idea about your question.lllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll
What happens when cold water meets warm water?
it becomes a mixture of a warm and cold water :)))
Why does hot water evaporate faster in cold weather?
because in hot water you will be having more fast moving molecules compared to the cold one...the more you have them,, the faster the h20 evaporate..
Do sound waves move faster through cold or warm air?
warm air
Do cold water freeze faster than warm water?
yes
What will celery absorb faster warm or cold water?
warm water because the cold water will freeze the cell wall.
Does warm water freeze faster than cooler water?
no because the cold water speeds up the process by starting it
What freezes faster warm water or cold water?
Cold water, less energy must be removed from cold water to make it freeze. warm water has more energy which needs to be removed before it freezes. it is an urban myth that warm water freezes faster.
Does warm or cold water freeze first?
cold water
Does sugar dissolve faster in cold or warm water?
Salt dissolves faster in cold water
Do flowers drink cold water or warm water faster?
cold water faster
Does a boat sink in hot warm or cold water faster?
It sinks faster in hot water than warm or cold
Why does water freeze faster?
because water is generally cold unless heated in a kettle. Coffee on the other hand is warm when you make it so if the water is colder to start with it will take less time to freeze.
Does warm water freeze faster than cold water?
An unresolved question! See Mpemba Effect in wikipedia for the best experimental conditions for this anomaly!
Which moves faster cold or warm water?
Warm water of course.
Is there a chart or graph showing why hot water freezes faster than cold water?
Warm water doesnt actually freeze faster. Distilled water (which you can get from boiling and collecting the steam) freezes at 0C or 32F. Water (such as tap water) with impurities will only freeze at a lower temperature.
