what is heaver? hot water or cold water?
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
247767
Water can be compressed, when you compress something it cools, so when you compress water fast enough or with enough pressure it will just freeze.
240367
Endothermic.   It takes (heat) energy to vaporize a liquid.\n\nThink of evaporation from the skin.  It feels colder when you're wet.   It takes heat energy away (endothermic) from your skin when the water evaporates.
100228
The temp. between hot water and steam is a big difference. Say that steam is at 400 degrees F and hot water is 180 degrees F, steam will boil your hand faster then hot water.
660432
Cold water is the best in this situation. Ice is too cold and can damage the surrounding area.
131139
Absolutely not!! Try it for yourself, with equal amounts of each in the same freezer, in the exact same kind of containers, checking at given time intervals. Use logic, the warm water has to cool down to the temperature of the cold water before it can do anything. The cold water already has the head start!!
1017824
Hot water will drop in temperature at a faster rate, but the cold water will freeze first except under certain circumstances in a phenomenon known as the Mpemba Effect\n\nhttp://math.ucr.edu/home/baez/physics/General/hot_water.html\nfor more details on the phenomenon
166782
The cold water froze about 10 or 15 minutes faster than the hot water, and there was no detectable difference between the boiled water and the other kind. Another old wives' tale thus emphatically bites the dust. Science marches on.
280538
Hot...In an open container of skating rink, hot water evaporates more quickly and thus cools more quickly.  At sufficiently high temperatures, evaporation is more important, if equal masses of water are taken at two starting temperatures, more rapid evaporation from the hotter one may diminish its mass enough to compensate for the greater temperature range it must cover to reach freezing.
34255
I would have to say hot water.
471175
I like both hot and cold showers so what i do is have hot shower first followed with cold water shower...
1038552
WATER. It's that simple.
1057215
Because it's easier to clean up, the hot water makes the veins rise to the surface of your skin and makes the blood flow faster AND the hot water relaxes you until you pass out from the blood loss.
1118061
Warm water increases blood flow, and if you prefer cold showers the cold water is stimulating. Also the smell of the soap no matter how light is somewhat therapeutic. There's also the feeling of washing away problems,stress, anger, and all negative things down the drain.
1040977
It is done with steam. Just simple steam that you might get from a tea kettle. It doesn't have to be under pressure or any hotter than 212 deg F.
459601
Cold water probably washes away some of the lubrication (phlegm, I guess) from your throat and can make a tickle worse or make a cough drier and more persistent. Something that coats your throat would make a cough go away, and water, as great as it is, does just the opposite.
1163536
The definition of freezing is that they reach 0C, not that they turn to a solid, that is a separate step.  Hot water pipes and cold water pipes, both in an identical freezing environment will cool down at different rates because the higher the temperature gradient or difference, the faster the rate of cooling.  So hot water will cool faster to 0 than cold water, although cold water will form ice faster since overall it requires less heat overall to be removed to freeze.\nNote that practically the hot pipe will take longer to freeze solid since there simply needs to be more energy removed to get the solid.  This question is normally asked theoretically to demonstrate (or trick a student) to teach the lesson about how larger temperature gradient have a higher cooling speed relative to the lower temperature gradient.  It depends on the reason for asking this question.\n\nNote that the Mpemba effect, while it has been observed, is only under specific experimental conditions and is far from a general phenomenon and not general enough to effect the average set of pipes in the average house basement.