At what temperature will hair freeze solid and break off? Flexible hair keeps polar animals safely warm.?
488787
Hair will freeze at 0 grades Kelvin.\nAnd at the second question it's yes.
359348
One difference we have in comparison with a lot of other mammals is that we have a lot of sweat glands in our skin. They help to prevent our bodies from overheating, especially during exercise. As sweat cooling your body works best if the air on your skin can move easily (and especially if a breeze of air is blowing) I would guess that fur/hair would decrease the efficiency of this cooling system a lot. As humans are supposed to have evolved in warm areas of Afrika, protection from cold was not an issue for keeping hair. And protection from sunburn - as a upright walking species we kept our hair on the place where sunburn would be most of a problem. \nThat's my guess, so that may not be true, but I read not too long ago that sweating allows humans to exercise much longer without overheating than a lot of animals (and so hunt an animal to its heat exhaustion, despite if may be able to run faster), if you look up these studies you may find more.\nPS. I found at least one source for that theory, I added it below
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)
8960
Depends on the air temp.... theres days where I have left ice fishing at night.. came back the next day and could poke a hole in the ice with my finger....\n\nIf your in an fish house and have it banked really well, the holes don't freeze as fast.
895765
Temperature must get below 32 degrees Fahrenheit or 0 degrees Celsius.\n\nWhen it gets that cold, the H2O particles have more resistance moving around until they move around less and less until water freezes. The particles are still moving... just very slowly. The particles also get larger in this process; thus the reason why ice expands.
504847
It gets colder. So clearly not isothermal (which means it stays the same temperature). It's adiabatic because no energy is released or absorbed.
733661
How far below?\n\nWater has quite a high thermal conductivity value.  Depressing the freezing point can be obtained by adding a salt, such as table salt (sodium chloride) or even calcium chloride.  Maple Leaf Gardens (the old NHL hockey arena in Toronto, Ontario) use to use a brine (salt water) solution in the cooling system to keep the ice frozen.\n\nIf you weren't worried about corrosion, you could try a brine (saturated salt solution) in your cooling system.  Water has a thermal conductivity of approximately k=5 to 6 mW/cm/K (relative to carbon tetrachloride or toluene being close to 1 and still able to go well below 0C/32F and remain liquid).  (CRC Handbook of Physics and Chemistry...do your own unit conversions)\n\nDon't let the brine leak though....
852607
not very cold won't be a very bad idea.
752303
Not quite but close. A Polar Bear's Skin is actually black and the individual strands of fur are pretty much transparent. The fur however is very good at trapping air and air is one of the best heat insulaters in nature. The helps the polar bear stay warm. A side effect of all that trapped air is that the Polar Bear will appear to be white.
701812
hehe that's funny.\n\nBut I would not want to be cryogenically frozen! :)
644673
They get cold. \n\nThere are some effects on magnetic properties when you go very cold (search on magnetism AND temperature) especailly for electromagnets. Some things which aren't magnetic start to become so and things which are magnetic become more so. You wouldn`t notice much if you used a home freezer, you need to get much closer to absolute zero.    \n\nMaking it hot has a more important effect. A permanent magnet heated to above its Curie temperature will lose its properties.
16969
It's a solid, so it's already frozen. Heat it up enough, and it will melt.
615371
If the air cools to truly frigid Arctic temperatures such as -40 C and below then the moisture capacity of the air will be so low that likely not much snow can occur. Only at these extremely low temperatures is the phrase "it is too cold to snow" fairly valid.\n\nAt the temperature of absolute zero ( 0 K, -273 C, -459 F) all air including water vapor condenses and loses all molecular energy. The temperature can not cool below absolute zero. \n\nIts can't snow in deep space.......
560889
It would be a cold blooded animal, meaning it has no homeostatic mechanisms to regulate it's temperature (where warm blooded animals do things like sweat to cool them down, or shiver to warm them up). \nThe scientific name for a cold blooded animal is an 'ectotherm'.
1040566
average temperature in the winter is around -72f.  lowest temperature recorded is -129f.  it can feel a lot colder than its actual temperature, because antarctica is not only the coldest, but also the windiest in the world on average.
175159
Solid\nCopper melts at 1083ºC
704567
It depends on what you mean by "does it get warm?". See below.\n\nIt can snow even at incredibly cold temperatures as long as there is some source of moisture and some way to lift or cool the air. It is true, however, that most heavy snowfalls occur with relatively warm air temperatures near the ground - typically 15 F or warmer since air can hold more water vapor at warmer temperatures.\n \nWhen is it too warm to snow?  How does snow form if the ground temperature is above freezing?  Snow forms when the atmospheric temperature is at or below freezing (0 C or 32 F) and there is a minimum amount of moisture in the air. If the ground temperature is at or below freezing, of course the snow will reach the ground.\n\nHowever, the snow can still reach the ground when the ground temperature is above freezing if the conditions are just right. In this case, snowflakes will begin to melt as they reach this warmer temperature layer; the melting creates evaporative cooling which cools the air immediately around the snow flake.This cooling retards melting. As a general rule, though, snow will not form if the ground temperature is 5 C (41 F).