Why is water at 64 degrees fahrenheit dangerous while the same temperature in the air isnt?
342866
Because the water conucts the heat away from your body very well and thus lowers your body temperature
288935
Fresh water freezes when the temperature of the water is 32*F and the pressure is normal atmospheric pressure. And then, if there is a heat loss for that fresh water, then it would freeze at lower pressures also. \nIf ice is at 32*F and there is a heat gain, it would melt at 32*F. Also, if at 32*F with no heat flow there is higher pressure, then ice would melt. (eg skiing. If you put your pressure on the skis, the ice/snow melts and becomes water so that you can ski)
524560
Yup, it's A.  The air is saturated with water, so the sweat on your body doesn't have the chance to evaporate to cool you.
868477
water freezes at 32 degrees Fahrenheit, and 0 degrees Celsius\n\nthe colder the faster
638380
Heat will always travel from the warmer to the cooler. For example, an ice cube might be 32 degrees. If it is sitting in a room with an air temperature of 70 degrees, the heat in the air will travel into an ice cube until it melts completely. Once it melts, the water it was made of will continue to absorb the heat in the air until it is the same temperature as the air. The same occurs with oil in an engine, or any other object. Some things absorb or lose heat faster than others, and the more of a temperature difference there is, the faster the heat travels from the warmer object to the surrounding air, water, or whatever. An ice cube will melt much faster in boiling water than it will in cold water. Water will also freeze faster the colder the freezer is. I have proven this a number of times by putting room-temperature water bottles in various freezers. Some freeze in less than an hour, some freeze in several hours, depending on the freezer's temperature. Here's a conversion for Celsius and Fahrenheit.\n\nConvert Fahrenheit to Celsius F=1.8(C)+32\n\nConvert Celsius to Fahrenheit C=(F-32)/1.8 \n\nTo answer your other question, it has nothing to do with how many degrees per gallon of water in order to freeze it. What is important is that the air temperature is below freezing. The farther below freezing the air is, the faster the water will freeze. The more water there is, the longer it will take to freeze. The warmer the water is, the longer it will take to freeze. There are several variables. The volume of water, the temperature of the water, and the temperature of the air. It is the same for motor oil, or any other liquid. The rate of heat transfer is different for everything.
621912
This is called the Mpemba effect.  It occurs for other reasons than the temperature of the water,  Mostly because of the different characteristics of water at different temperatures.  This Site has a lot of information about it.
1104624
It's because of it's chemical composition. The specific way 2 hydrogen (H) atoms and 1 oxygen (O) come together to make H20 is why it has the characteristics that it does. But you're probably wondering why does water freeze at exactly 0 Celcius and boil at exactly 100 Celcius? It's because the Celcius temperature scale was based on water and it's characteristics. There actually should be another number in that range for when wate vapor (in it's gas form) turns into plasma but water vapor becomes incredibly unstable at high temperatures so it is very hard to get an accurate reading.
880980
This is actually not an easy question! It depends on what you mean by temperature. Here on Earth, in our cozy blanket of air at one atmospheric pressure, we think of temperature as how hot something is. But on a microscopic level, that really means how vigorously molecules and atoms are bumping into each other. The faster they move, the harder they bump, and the higher the temperature. \n\nHowever, have you ever wondered why water at 70 degrees Centigrade might scald you, but air at that temperature won't? Air is less dense than water, so it carries less energy total even if the temperature is the same. The atoms are jiggling just as fast, but there are fewer of them. \n\nI bring this up because there can be ridiculously high temperatures in the Universe, but they don't mean much! For example, the Voyager probe measured a temperature of over one billion degrees in the magnetosphere of Uranus. Imagine! But really what it was measuring were particles moving extremely quickly. If you stood (well, floated) in Uranus' magnetosphere, you wouldn't suddenly vaporize. On the contrary, you'd freeze! The particles may be very very hot, but there simply aren't enough of them for them to heat you up. \n\nSo to answer your question, probably the hottest temperatures reached in the Universe today are in the cores of supernovae (stars that explode), or possibly in the mysterious gamma ray bursters, extremely energetic explosions the cause of which no one knows. But the hottest temperature of all time would have been the Big Bang: since it had all the matter and energy squeezed into one point, it must have had nearly infinite temperature! \n\nThere is no agreed-upon value, among physicists, for a maximum possible temperature. Under our current best-guess of a complete theory of physics, the maximum possible temperature is the Planck temperature, or 1.41679 ÃƒÆ’Ã¢â‚¬" 10^32 Kelvins. This translates to about a quarter of a hundred nonillion degrees Fahrenheit (2.5 x 10^32). However, it is common knowledge that our current theories of physics are incomplete, thus leaving open the possibility of still higher temperatures.\n\nThe answer a typical physicist gives to the question, "what is the highest possible temperature?" will depend on their implicit opinion of the completeness of our current set of physical theories. Temperature is a function of the motion of particles. If the speed of light is the universal speed limit, then a gas of maximum temperature may be defined as a gas whose atomic constituents are each moving at the speed of light. The problem is that attaining the speed of light in this universe is impossible; light speed is a quantity that may only be approached asymptotically. The more energy you put into a particle, the closer it gets to moving at light speed, though it never fully approaches it.\n\nAt least one scientist has proposed defining the maximum possible temperature as what we would get if we took all the energy in the universe and put it into accelerating the lightest possible particle we could find as closely as possible to the speed of light. If this is true, then discoveries about elementary particles and the size/density of the universe could be relevant to discovering the correct answer to the question this article addresses. If the universe is infinite, there may be no formally defined limit to the maximum possible temperature.\n\nEven though infinite temperature may be possible, it might be impossible to observe, therefore making it irrelevant. Under Einstein's theory of relativity, an object accelerated close to the speed of light gains a tremendous amount of mass. That is why no amount of energy can suffice to accelerate any object, even an elementary particle, to the speed of light - it becomes infinitely massive at the limit. If a particle is accelerated to a certain velocity near that of light, it gains enough mass to collapse into a black hole, making it i
419356
I will take a stab at it.  I am guessing it is because water has more degrees of freedom.  In the liquid there is also rotational degrees of freedom to absorb energy that the solid ice does not have.\n\nTo Neil, the formulas are for heat capacity and have nothing to do with the way something is heated, only the amount of energy that it takes.\n\nNor does it have anything to do with Newton's law of cooling.
893761
Using the particle theory of matter, the movement of particles in any matter (i.e. one that has mass and occupies space) increases (i.e. particle speed increases) with its temperature.\n\nWarm water has a higher a temperature than cold water.  Hence, the particles in the warm water move at higher speeds than that in cold water.  Moving at higher speed means having greater kinetic energy.  Thus, easier for the particles to break the inter-molecular forces present among the particles in the liquid to travel into the air.\n\nBy the way, this question should have been placed under the physics field.
426088
actually, water heats up and cools off slower than soil.  Water takes more energy to heat up and once it gets the energy it takes time for it to lose it. Citys near water have a more constant temp. than cities that arent near water. It can be 80 one morning in Kansas then 10 degrees that night
932412
Well, if you're talking about water, that would be 0 degrees (freezing) and 100 degrees (boiling)
516732
Well, the temperature doesn't matter. What does matter is the concentration of the water outside of you. It's osmosis/diffusion. You have water in your body and there's water outside of you; but the water outside gonna have a higher concentration that the water inside of you. This is when you take into consideration that the water outside of you  will include dirt(some salts) and other chemicals like from your soap or shampoo, which is why it's concentration is higher. The whole process of your fingers shriveling-up is because the water inside of you leaves your body in attempt to balance the concentration outside to equal yours.
46526
it doesnt, however the energy is lost faster in hot water than in cooler water.  The rate at which all water freezes is the same.
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
259573
Ice water? If you have ice and water together they keep each other at the same temp. 0 degrees C. If you add salt this will make the ice melt at a lower temp. which will cause the water to be lower temp. also, giving you a below 0 C reading.
1080300
u can't have water upto 40 below zero!!!\nthe lowest temp(in centigrade) u can reach is -12 c \nthis is achieved by a process called super cooling\nin this the temp of the surroundings is controlled, and care is taken that the surface of the water is not disturbed\nsimilarly u can super heat water upto 137 c