what are the temperatures for freezing water on the Celsius and fehrenheit scales? for boiling water?
412780
freezing: 0 C,  32 F\nboiling: 100 C, 212 F
311960
Cold tap water is about 50 degrees.  Hot is limited to about 120 to prevent scalding.  100 is what you might consider "warm" water.  There's more distance between cold water temperature and warm (100-50=50 degrees difference) than between hot water and warm (120-100=20 degrees difference)  Just looking at the numbers, you'd have to add 2.5 times as much hot to warm up the cold than the other way around.  (This is the basic idea - a more complicated description would require that I break out my heat transfer book...)
490085
The Celsius temperature scale is divided into 100 degrees, where 0 is the melting point of ice and 100 is boiling point of water. There is no difference between + 1degree and 1 degree celsius, it depends on the context: +1 degree indicates a temperature rise whereas 1 degree is an absolute measurement.
868477
water freezes at 32 degrees Fahrenheit, and 0 degrees Celsius\n\nthe colder the faster
825292
i guess I'm wrong   but I thought that water would  freeze at 0  degrees celsius.  also it would boil at 100 degrees C. Even in a vacuum.  my guess!  btw at absolute 0  kelvin,  does that only exist in a vacuum?  If we could reach  - 450 degrees F.  would our cpu's operate at an infinite speed.....got me on this one.  I'm not sure on how atmospheric pressure relates to these conditions.  But I know someone knows!
908018
You've got your Farenheit mixed up with your Celsius.\nBody temperature is measured in Farenheit degrees.\nAll those other hot things you wanna touch (but can't) are measured in Celsius degrees.\nThey're 2 different measurements of heat.\nThat pot of boiling water on your stove is 100 degrees Celsius,but it's also 212 degrees Farenheit.\nYou might be running a high fever at 100 degrees,but you won't be boiling water by setting a pot on your forehead.\nYou might also be confused when you hear the weather report.32 degrees is freezing when you're talking Farenheit.0 degrees is freezing if you're talking Celsius.
154145
Or you could do it yourself using the formulas F=9/5C+32 and C=5/9F-32.  1 degree Fahrenheit is 5/9 of 1 degree celsius (and vice versa) and you add or subtract 32 degrees because freezing is 32F and 0C.
1106588
Normally at 0ºC or 32ºF.  At that point water just begins to crystalize.\n\nThere are cases when water will not freeze, like \n- freezing point depression due to hydration,\n- freezing point depression due to osmotic effects (these are both equilibrium effects),\n- supercooling: the delay or absence of formation of an ice crystal in the absence of efficient ice nucleators and/or\n- the high viscosity\n\nFor every 0.5ºC (1ºF), water's viscosity will change by about 1.5%.\n\nWater viscosity is inversely related to temperature. The lower temperature, the higher viscosity.\n\nBut, water's dynamic viscosity at 0ºC is 3.732µ [ 10-5 (lb.s/ft2)] and the kinematic viscosity is 1.924v [10-5 (ft2/s)].
601632
Water boiling has to do with air pressure.\n\nThe higher your elevation, the less pressure exerted on the water, so it can boil at a lower temperature.\n\nThe closer to sea level you get, the more air pressure there is, so it requires more energy to boil.  (Going lower then sea level will still increase the boiling temperature).\n\nIt's also important to note, that when water is boiling, it keeps a constant temperature.  So if you look at this graph of time vs average temperature....\n\n|.........../..\n|........../..\n|....------.... <---  Boiling Temperature\n|../...........\n|./............\n\nYou see that when the boiling occurs, the temperature does not increase.  Only when all the water is evaporated does the temperature increase.  This ALSO works for ice in water.  The water will remain at 0 degrees celcius till all the ice is melted.\n\nHope this helps you understand melting/boiling points.
780627
WATER BOIL AT:  27*C at 26.739 (pressure(torr)  thru 30*C at 31.824\n pressure(torr)
1097232
Have you heard of boiling and freezing points. Each substance has a boiling and a freezing point there is a different one for each substance. The freezing point of H20 (hydrogen and oxygen) is 32 degrees Fahrenheit and the boiling point is 212 degrees Fahrenheit. Now these temperatures could be different if the water has anything else in it changing the molecular structure. Things like salt, calcium, ect. So in your bottle story....The gas (common air) which has things like helium, carbon and oxygen is on top and your water is on the bottom. This could get confusing but essentially when you shake it up you added other molecules into the water that have a lower or higher freezing point. Same idea as when you have a partially frozen bottle of water and you shake it up and it defrosts. It also has to do with the first law of thermodynamics...Energy can not be created or destroyed just transferred. So some molecules do not have enough energy to bond with one another but when you shake up the bottle it transfers energy allowing them to bond with one another. Hope I didn't confuse you too much.
745215
The answer is yes. And I bet you want more of an explanation, which gets a little tricky. It would seem evident that cold water would freeze faster than warm water. But there have been raging debates in scientific circles over whether that's true or false. The fact is a lot of different factors contribute to how fast water freezes, including its beginning temperature.\n    Physicists writing in the journal Scientific American have waded into the fray and have probably come the closest to a satisfactory answer. Quoting Paul G. Hewitt in the book Conceptual Physics, the Scientific American writers believe that hot water will freeze faster than lukewarm water, but not faster than cold water. (Except under certain circumstances.)\n    According to Scientific American, water at 90° C will freeze before water that is 60° C. Below 60° C, however, there is a switch and the cooler water will freeze faster. For example, 30° C water will freeze faster than 60° C water. It has to do with the water evaporation of the hot water immersed in a cold environment. The rate of cooling by evaporation is way higher for hot water than for the cooling of lukewarm water.\n    Now, for those certain circumstances. When you put a pan of cold water and a pan of hot water in a freezer (both pans have equal masses of water), the hot water experiences this rapid evaporation AND freezing from below, which cools water on the bottom of the pan. Because the surface water is already warm or hot, the water at the bottom just sits there instead of rising, getting colder and colder. The water at the top experiences evaporation. The combined effect could make the hot water freeze faster than the cold water.
975732
Substance: Water\nLatent Heat Melting J/g:  335\nMelting Temp°C: 0\nLatent Heat Boiling J/g:  2272\nBoiling Temp °C: 100 \nHeat of vaporization (kJ/mol): 40.65
845517
One way is to use the Clausius-Clayperon Equation.  See the link below and use the boiling point of water for one of the pressure and temperature pairs.  \n\nP.S.  It's equation 22 in the linked document.
409095
It's used as a reference in chemistry for almost anything matter related.\n1.  It's used as the standard of 1g/ml for density.\n2.  It's used as the standard of 1cal/g for specific heat.\n3.  Its freezing point and boiling point define the Celcius temperature scale.\nThat's all I know of, but there's probably more.
316108
It depends on the purity of the water and the pressure of the system.  Pure water in normal atmospheric pressure boils at 212 F.
530330
Ice melting\nWater freezing\nWater boiling\nAmmonium chloride subliming