if water will boil at 0 degree Celsius where in vacuum,at what point in vacuum will it also freeze?
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!
282772
Like all elements, its physical state depends on temperature and pressure. It is a liquid at room temperature, but can be frozen and evaporated at extreems.\n\nIt freezes at -38.83 °C, -37.89 °F\nIt boils at 356.73 °C, 674.11 °F
331943
Should think so.\n\nYou can take a pot of water and an intense laser with you to space (Combustion may not be your best bet, even if you are taking oxygen cylinders. It may get too unpredictable).\n\nOnce in space, direct the laser at the pot. In due time, it should 'boil'.\n\nWell actually, the behaviour of water at zero pressure is quite peculiar. It can be seen from the phase diagram that water skips the liquid state at low pressures, and exhibits sublimation. \nSo even if you manage to keep the water liquid until you ready it for boiling, the moment you expose it to space(meaning zero pressure) some of the water will immediately turn into vapour. The remaining mass, will, in the absence of any heat source, freeze. \n\nIf you do provide heating, it will obviously vapourize. \nThus, strictly speaking, it will not 'boil'.
560585
i have seen a pot of boiling water thrown into the air and freeze.  It was up north where it was about -20F  No it will not freeze your lungs
795407
Of course it does.  If your water is at 99C, it will boil a lot faster than if you heat it from a 4C temperature.\nSame is true fro the freezing part; although variations would depend on the presence of an open or closed container, as evaporative cooling will take place is water is allowed to escape.
383320
the idea isn't that water can't heat up when it boils at low pressure, but that it doesn't have to. no matter what temperature something is, its molecules are moving somewhat, and some of them escape as a gas. also, any gas always is condensing into a liquid or solid. when pressure and tempurature are constant, these processes reach equilibrium where they cancel each other out. at high temperature, more gasses escape, and at low pressure, less gases return to liquid. so at somewhat low temperature and relativly lower pressure, even though few gases relatively escape, even fewer return to liquid, so the net effect is that the liquid evaporates at low temperature. if the temperature were raised, it would boil even faster.
489650
No. Hot water will boil quicker because it is closer to water's boiling point. At sea level the bp of water is 100 C. (The boiling point is a little less at higher elevations). Once it gets heated to that it doesn't get hotter but rather it changes to a vapor. Cold water requires more energy over a longer period of time to heat it to the required temperature to reach its boiling point.
786403
a) a lower freezing point than pure water
1096429
Ice requires a crystalline lattice structure. The salt ions (Na+ and Cl-) physically interfere with the formation of that lattice structure by standing in the way of water molecules. A lower temperature is therefore necessary to form ice and so water that contains ionic salt can drop to lower temperatures before forming ice. The same general effect applies to boiling water. Because the salt prevents molecules from escaping into the atmosphere as gas, the boiling point is raised.\n\nNote: I assume you meant 0 degrees Celsius. The Fahrenheit scale is somewhat different, since water freezes at 32 degrees Fahrenheit. But don't let these numbers cause you to believe something different is going on in the salt/water/ice mixture. The Celsius scale is set such that water freezes at 0 degrees (absent salt). This doesn't mean that at 0 Celsius and below there is no temperature or energy. Just the same, below 0 degrees Fahrenheit compounds still have energy and temperature. Scientists tend to use another scale which more accurately depicts true temperature, which is the Kelvin scale. In the Kelvin scale, absolute zero- the temperature at which all molecules and atoms stop moving- is really 0. But 0 Kelvin is much lower than either 0 Celsius or 0 Fahrenheit. To convert from Celsius to Kelvin, just add 273 degrees (or subtract 273 from Kelvin to Celsius). So 0 Celsius is actually 273 degrees Kelvin.  \n\nIn any case, if you were looking for an answer that has to do with the chemical properties of the salt/ice/water mixture, and why, for example, salt tends to lower the freezing point (or raises the boiling point), my first answer is right.  Any solute you add to a solvent will change the colligative properties of the solvent.  It interferes with the organization of water molecules such that they have a harder time aligning into a crystalline ice pattern, and therefore a lower temperature is required for ice to form. Note also that whenever you have an ice/water mixture, the entire mixture maintains the same temperature until all of the water has turned to ice. That is, in pure water that contains ice, the water will stay at 0 degrees Celsius until all the water has turned to ice, and then the ice will gradually drop in temperature. The salt just lowers that freezing point, but the same applies, just that the salt/water/ice mixture remains at that lower freezing point until all water as frozen, then it drops further in temperature.
597803
D) It's heat of fusion is higher than its heat of vaporization.\n\nWater's heat of fusion is: 334.5 kJ/kg\nWater's heat of vaporization is: 2256 kJ/kg\n\n\nE IS NOT CORRECT BECAUSE: Water is denser than ice. If water was not denser than ice, ice would not float.\n\nAnd Mr. the_bendude, you must have never taken chemistry. Heat is not the same as temperature. Yes, water boils at 100C and freezes at 0C, but that does not mean those are the heats for which it does.
209676
Neither can freeze.  Boiling water is 200+ degrees F.  Room temp is roughly 70 degress F.  Now, if you meant does something at room temp freeze faster than something that is at boiling (water), then the answer is, in general, yes.
461446
I found that cold water (38 degrees Fahrenheit) froze faster than hot water out of the tap (125 degrees F). I chose these two temperatures because (1) they were pretty much what the average amateur ice-cube maker would have readily available and (2) I couldn't find a mercury thermometer that went higher than 125 degrees.\n\nJearl, who is not afflicted with penny-pinching editors like some of the rest of us, was able to get his mitts on a thermocouple that could measure as high as the boiling point, 212 degrees F. He found that water heated to, say, 195 degrees would freeze three to ten minutes faster than water at 140-175 degrees. (There were differences depending on how much water was used, where the thermocouple was placed, and so on.) \n\nJearl suggested that the most likely explanation for this was evaporation: when water cools down from near boiling to the freezing point, as much as 16 percent evaporates away, compared to 7 percent for water at 160 degrees. The smaller the amount of water, of course, the faster it freezes. \n\nIn addition, the water vapor carries away a certain amount of heat. To test this theory, Jearl covered his lab beaker with Saran Wrap to prevent water vapor from escaping. The freezing rate difference was greatly diminished. Conceivably convection (motion within the water) also plays a role.\n\nFascinating as all this no doubt is, all it basically proves is that very hot water freezes more slowly than very VERY hot water. The ordinary fumbler in the fridge, on the other hand, is dealing with temps more like the ones I was measuring, in which case cold freezes faster than hot. I rest my case.
932412
Well, if you're talking about water, that would be 0 degrees (freezing) and 100 degrees (boiling)
979481
In science you must have studied that the boiling point of water drops with a reduction of atmospheric pressure.\nAt  a pressure of zero atm(atmosphere), which is vaccum, water will boil at room temperature.\nThis boiling is actually the release of the air mixed in the water.\nWhen a pump has a suction  more than 1 atm. which is roughly 27.7 feet, the vaccum created by the pump causes the air in the water to be released as mentioned above.\nThis release of air is known as cavitation.\nCavitation also occurs when the propellor of a boat or ship moves too fast though the water creating a vaccum on the blade surfaces.\nThat is why you see a 'wake' behind a boat or ship
658781
Freezing and Boiling points of Water are:\n\n 0 and 100 degrees Celsius\n32 and 212 degrees Fahrenheit\n\nFrom the equation of a straight line,\n\nF = mC + A\n\nwhere m is the gradient and A is a constant\n\nm = (212-32)/(100-0) = 1.8\n\nF = 1.8C + A\n\nwhen x=0, F=32\n\n32 = 1.8(0) + A\n\nA = 32\n\nTherefore the final equation is:\n\nF = 1.8C + 32\n\nor\n\nC = (F - 32)/1.8
227906
Put water under a vacuum. It will boil at room temperature. \n\nOr do you just want to create the illusion of steam? You could put dry ice in water. Then it will be could and appear to be steaming and boiling. And many people will think it is steaming.
862439
The steam.  It would have to go through a phase change and give up a bunch of energy to turn back into water at 100.  Assuming you mean equal mass of water and steam. \n\nSame question for ice.  How much energy does it take to melt 1 Kg of ice at 0 to water at 0?