what tells us that 0K (zero degree Kelvin) is the absolute minimum temp. ?

Question

just curious...
and yes i know that the background radiates at 4 Kelvin ;)
what defines heat ?

Answer 1

Heat is generated by random motion of an object -- you can think of a hot object as vibrating more (at an atomic level) than a cold object. Things are still vibrating at 0C and at 0F -- but at 1 degree K, they're vibrating very little and at 0K, they would stop altogether and thus give off no heat at all.

It's a theoretical limit -- getting to 0K is very difficult, if not impossible -- but a limit that's well defined (that is, the decrease in motion corresponds to a decrease in degrees K, so 0 can be defined to be the point where that motion would reach zero). You can't have "negative" vibration, so 0 is indeed an absolute minimum.

Answer 2

0k has been established by mathematical extrapolation. for instance, if you know the pressure of a given gas at a certain temperature, you can reduce the temperature and take another pressure reading. by plotting this on a graph, the temperature/pressure relationship will take you to absolute 0.

heat is defined as molecular kinetic energy. when an atom is in a state of true absolute zero (which is impossible btw, 3rd law of thermodynamics), it has no molecular movement whatsoever, aside from quantum jitters, which is when it gets really weird. look into quantum superfluidity for more on this.

Answer 3

Why would he, laws and conditions do it for him? Non-biblical 17 Now, if there be two things, one above the other, and the moon be above the earth, then it may be that a planet or a star may exist above it; and there is nothing that the Lord thy God shall take in his heart to do but what he will do it. Abr 3:18 18 Howbeit that he made the greater star; as, also, if there be two spirits, and one shall be more intelligent that the other, yet these two spirits, notwithstanding one is more intelligent than the other, have no beginning; they existed before, they shall have no end, they shall exist after, for they are gnolaum, or eternal. Abr 3:19 19 And the Lord said unto me: These two facts do exist, that there are two spirits, one being more intelligent than the other; there shall be another more intelligent than they; I am the Lord thy God, I am more intelligent than they all.

Answer 4

heat is the rate of molecular movement...how the molecules bounce off eachother even in a solid.

by definition of the kelvin scale all molecualr movement stops a 0K. Note. the electrons still spin, this isn't atomic movement...

the molecules just stop bouncing off eachother...when they do bounce off eachother be it solid liquid or gas..this is heat...also note, not meaning through motion, like wind or water currents, but the little motions of collisions.

Answer 5

Heat is the mode of heat transfer that results due to a temperature difference. Thus, to know heat, one needs to know what temperature is.

A consideration of the second law of thermodynamics...
(i) using the idea of a Carnot engine's efficiency shows that there is an absolute temperature scale
(ii) leads to a way of defining of temperature using the concept of entropy.

There are cases of negative temperature. Understanding what this means requires an understanding of the fundamental meaning of temperature elucidated from a consideration of the second law of thermodynamics. (I have not yet understood the negative temperature concept, so i'll just mention that its out there :)

Answer 6

termperature is defined by the avergage kinetic energy of all the molecules in a substance. At absoljute zero there is no knietic energy because the molecules aren't moving. and you cant get muhyc less kinetic energy than still.

perhaps it could get colder, but we could have no way of knowing becasue the atoms wouldnt move so thermometer would stay solid and the same density

Answer 7

Temperature is the measure of the average molecular enerby of a substance. Absolute zero, or 0K, is the temperature at which molecular energy is a minimum, and it corresponds to a temperature of -273.15° on the Celsius temperature scale.
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Answer 8

0K is defined as the absolute minimum temperature, i.e. the temperature of something which has zero thermal energy.

Answer 9

Heat is the vibration of molecules. They stop vibrating at absolute zero.

Answer 10

Dats da temp at which we guys up here in Visconsin actually zipper up our jacket and start warming up our cars before leaving da house.