need help on my reference list it is about my sciece project im doing( which freeze faster hot water or cold)?
541181
See this answer.  Dig into the citations for the reference articles in them.  The second also has references.\n\nHot freezes faster in many cases, given certain controls such as same amount of water, same size and shape container, standard pressure etc.  There  is at least one experiment showing that water at 90 degrees C will freeze quicker than water at 18 degrees C.  This is significant since one side is quite close to boiling and the other is basically room temperature.\n\nIf you are not a high school student, I would look up linear programming ( a branch of algebra not computer science) and develop a sensitivity analysis to determine the impact of various effects.
353832
The answer depends on many variables, including:\n   - How hot is the hot water?\n   - How cold is the cold water?\n   - How cold is the freezing environment?\n   - What is the humidity in the freezing environment?\n   - Are the water containers covered or not?\n\nThere is a famous experiment in which boiling water in an uncovered container exposed to dry, barely-below-freezing air froze before a container of the same amount of room-temperature water in the same conditions.\n\nThis only happened because much of the hot water evaporated in the first few minutes, leaving a much smaller mass of water in the "hot water" container than in the "cold water" container.\n\nIt is not hard to show that a small mass loses heat faster than a large mass. So, ultimately, the "hot water" froze first.\n\nIf you run the same experiment with sealed containers, the cold water freezes faster because it has the same mass and less heat to lose before freezing.
870748
The maximum rate at which something can freeze depends on how fast you can remove heat from it (assuming that it started at freezing point, and so you are only removing latent heat). \n\nThis depends on so many factors that it would be impossible to quote a maximum rate. It depends on the temperature of the surroundings, the nature of the water surface/vessel, surface area to volume ration and any movement in the air/liquid surrounding the water. \n\nFor instance, a 1 litre cube of water in air at -30C will take a while to freeze, while a drop of water will freeze almost instantly.
530330
Ice melting\nWater freezing\nWater boiling\nAmmonium chloride subliming
292815
The answer is no and sort of.\n\nWater at 38 degrees (i.e. from the refrigerator) will freeze significantly faster (10 to 15 minutes faster) than hot water from the tap (125 degrees).  This is the range of temps most people are going to be dealing with.\n\nHowever, water at 190 degrees will freeze faster than water at 140 degrees.  The main reason is that more of the hotter water will evaporate before reaching freezing temps, so the ice cubes are significantly smaller - about 7/8ths the size of the cooler water.  Putting plastic wrap over the heated water reduced the time differential significantly.  \n\nI think the moral of this story is that you can get nearly any result you want by manipulating the conditions correctly.\n\nAlso, I feel the need to correct the second answer above.  Cooling is the process of slowing down molecular movement, not speeding it up.
662532
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 for more details on the phenomenon
237724
Infact, FLOWING water does freeze. but FLOWING WATER cannot freeze completely at 32 degrees providing it is attinaing warmth from somewhaere else. If you check the temp of a glass of ice water. It is 32 degrees but it is not completely frozen! 32 degrees is when ice begins to form &/or can sustain itself. The only reason your ice melts is because the water temp surrounding the ice is conducting the heat of the room which in turn tries to rise the water temp. While the ice is trying to hold the temp @ 32 degrees. Eventually the ice will melt; it releases cold in the form of water, to cool the water surrounding it. But because the warmth of the room is indefinate, the ice will eventually melt away as it is unable to hold the temp. Now if you put you ice water in a freezer that's set at 32 degrees. Your water will freeze. Because the water is no longer drawing the energy it needs to sustain its heat so the ice wins and freezes the water. \nSo how the heck does this pertain to rivers and moving water?\nMoving water is gaining warmth from the ground and the air. but becaue its moveing the temp of 32 degrees is not easily sustained so the ice melts and refreezes as it travels, because the weather changes and temps change ect. The only way to freeze moving water it to either:\n1. Have it be so cold that the water nearly immidiatly freezes (well below zero) or \n2. Have a sustained temp of below 32 for several hundreds of miles. \nNow if you put the water in a water rocker and put it in the fridge at 32 degrees it will freeze solid at some point because the temp is sustained and really how long it takes for it to freeze is the ultimate question. which depends entirely on the temp.\n-hope that helps
932234
Don't know which is strongest, but hot is fastest.\n\nYou can catch cold.
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
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.
323207
You could test whether or not salt really does make water freeze more slowly or boil more quickly. Just get four containers of water--two for boiling and two for freezing--and a thermometer. \n\nWith one of the containers without salt, put a thermometer in it and boil and time how long it takes. Mark the boiling point temperature and time. \n\nDo the same thing but one of your containers with salt. Compare your temperatures and times.\n\nThen, you can do the same two steps with freezing with the other two containers.\n\nIf you wanted to get really crazy, you could test to see whether a lot of salt vs. a little amount of salt makes a difference. Or, if you wanted to tone it down, you could do only one--the boiling or the freezing. \n\nThis seems to me like concepts that a second grader could handle.\n\nGood luck!
621743
We cannot make a substance cold. \n\nWe can remove the heat from one place to another.\n\n  What is the difference between ice and water?\n\nFrom ice we have removed heat. The water is water because we have not removed heat from it. \n\nWe should not say ice is cold when compared to water, because we have not made it cold but we have removed heat from it.\n\nSimilarly when we want some hot coffee, we should ask, I want a coffee in which heat is added because we cannot make coffee hot.\n\nThank you.
819865
Conservation of energy.\n\nCalculate the amount of heat stored in the 28ºC water using 0ºC as the starting point.  This energy must first melt the ice, for which you'll need to use the heat of fusion of water.  The remainder of the energy will warm up the entire amount of water.
650071
cold water boils faster for the same reason that hot water freezes faster. I don't know what that reason is.
801436
Use specific heat capacities and latent heats of these materials along with your head to get water at 0C
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)
602506
1. Water boils- 212 degree F/100 degree C\n2. Normal Body temp- 98.6 degree F/37 degree C\n3. Water Freezing temp- 32 degree F/ 0 degree C