Does hot water put out a fire faster than cold water?
826086
HEY CORA! Long time no logging in on Yahoo Answers. I think cold water puts out a fire faster.
242191
everything can burn at a high enough temp\nthey melt before burning because of physical properties\nit is part of the solid-liquid-gas chain\n***get smarter, dude, it is possible, have you ever thrown water on a fire that was 50,000 degrees?
696743
NO! water will boil faster in the water in an area  above 6,000 feet. At higher elevations, where the atmospheric pressure is much lower, the boiling point is also lower, so it means it will boil faster.\n\nFor example: The boiling point of water is 100 °C (212 °F) at standard pressure. On top of Mount Everest the pressure is about 260 mbar (26 kPa) so the boiling point of water is 69 °C. It means lesser time to arrive to its boiling point.\n\nIf you were to boil water on Mount Everest,it  would be the lowest boiling point in the world because of its high elevation and low air pressure. If you were to boil water at the Dead Sea, it would reach the highest boiling point on Earth due to the low elevation and high air pressure. \n\nElevation affects the boiling point because of the amount of air pressure pushing down on the surface of the water. At a higher elevation the pressure is less and at a lower elevation  it is higher. When the pressure is higher, the molecules must absorb more energy in order to change state from liquid to gas therefore requiring more energy (temperature).♥
929239
because hot water has more energy than cold, giving the molecules more energy to move(melt)faster\n\n (i am trying to get to level 2 best answerer would help)
269248
Fire if what you are drinking is water.
291269
Cold water has more dissolved gases in it than hot water.  Any dissolved solutes cause the freezing point of water to be lower than pure water with nothing dissolved in it.\n\nThis means if your power goes out in the wintertime and it is about 32 degrees F outside, the water in your hot water pipes is more likely to freeze than the water in your cold water pipes.  This is because the freezing point of the water in your hot water pipes is higher than the freezing point of the water in your cold water pipes.\n\nSpeed isn't being considered here.  The cooling process is assumed to be slow so that the pipes are in thermal equilibrium with surroundings.\n\nAlso check out this link.  It is from the Alaska Science Forum.  They can explain the water pipes problem more correctly than me and they have more personal experience with the phenomenon.\nhttp://www.gi.alaska.edu/ScienceForum/ASF4/440.html
403230
It takes quite a lot of energy for water to change phase.  Steam actually contains much more energy than does boiling water, therefore it burns far worse when it comes in contact with human skin.\n\nSee the link below.  You can actually do the math to confirm this -- it takes 100 cal/gm to heat water from 0 to 100 degrees C, but 539 cal/gm to change that water into steam.  So ten grams of water at 0 degrees C absorbs 1000 calories to boil but nearly 6400 calories to turn completely into steam.\n\nThat's a lot of heat.\n\nIn rebuttal to some of the other answers, burns are caused (I believe) by heat convection -- that is, the hot substance in direct contact with the skin, transferring its heat to the skin cells and damaging or destroying them.  Water is more likely to stay in contact with the skin than steam is, because steam is a gas that rises away from the skin.  This is why some people seem to erroneously believe that steam doesn't burn.\n\nHowever if skin comes into continuous contact with steam, it will burn, and quite badly.
685907
Temperature speeds up reaction rate.  Until you had the high temperature (flame) the reaction (gas burning) couldn't happen.  The temperature is then more or less constant unti the gas runs out, and then the reaction stops but not due to temperature, just due to lack of reactant.
739180
Warm water is absorbed easier into the body.  Cold water takes longer to absorb, therefore burning more calories.
77192
No, adding salt does not make water boil more quickly. The colligative properties of water talk about freezing point depression and boiling point elevation. Water will reach a higher temperature before it boils when it contains salt (or any other dissolved substance).\n\nNucleation is a reasonable point, though. In reality, it's probably going to be hard to detect much of a difference. If you're cooking at high altitudes and you add salt to try to make the water boil faster, you're working against yourself.
480166
If you have an equal volume of hot and cold water the cold water will be heavier.  This is because when you heat up a substance it become less dense, and in general when you cool down a substance it becomes more dense.\n\nThe exception to the rule is water though.  Water is most dense at 3 degrees cesius, after that it start to take a crystalin form and when it freezes actualy expands.  \n\nso long as you are not saying that the cold water is 1 degree and the hot water is 3, then the cold water will be heavier\n\n\nBut remeber it is not by much in any case
125319
The ice water will cool quicker.  The reason being, that the water will cover the entire surface area that you are trying to cool.  \n\nThat being said, it also won't last as long because it also has more surface area for the cooling to escape.
194414
Water is denser than air and transfers heat more rapidly.
412700
If you put hot water in the freezer it turns to ice faster.\n\nA famous scientist named Kelvin figured that out because hot water molecules move faster so the cold in the rfreezer makes them slow down faster than cold water molecules which are already moving slow, so hence the hot water freezes faster the hot water is "shocked" by the cold as it were.
241754
Thermal intertia.  It works the other way too, cold water boils quicker than hot water.  The reason is when hot water is placed into the ice cube tray it immediately begins cooling.  Then when you put it into the freezer it continues to accelerate more and more quickly to the low temp desired.  Cold water would begin warming as soon as it gets put into the tray and then you have to cool it back down (opposite direction heating takes more energy)
451840
Quite obviously faster. To boil over and turn to vapour, the water molecules near the surface need a lower amount of energy when the water is being boiled in a rarer atmosphere.
511312
See my question about the age of the Appalachian Mountains.  And the similarities/ differences w/ Himalayans.  Oh yeah, Does hot water freeze faster than cold water?  If so, why?