is that possible to attain negitive kelvin degrees.?

Question

while measuring is that possible to have a reading as negitive or less than zero degree in kelvin scale

Answer 1

Temperature is indicative of the energy of a system. Ultimately temperature is a measure of the average energy of atoms or molecules of a system. The Kelvin scale is a scale that theoritically start from a state of a system with zero energy. Since energy cannot be negative (we havent observed one in nature) so consequently there is no negative temperature in degree kelvin.

So what happens really when an atom reaches the threshold of zero degree kelvin? Nobody has done an experiment that reached that temperature so far. To me I think its the opposite extreme of the big bang in the miniature scale. At the start of the big bang it was all energy, then it became cooler, some energy condensed to matter. So at zero degree kelvin, the system has no energy, I mean the system is pure matter with no internal energy.

Answer 2

Yes.

In statistical mechanics the temperature T is defined as 1/T=dS/dE, where S is the entropy and E is the energy. In a normal system adding energy always increasing the number of available states, leading to a more "unordered" state, so the rate of change on the right hand side is always positive, and so is the temperature. But that's not a law or fundamentally or a theoretical limit,as stated above

In fact there are some (pathological, and irrelevant for our everyday life) systems that lower their entropy when energy is added, for example the one dimensional spin chain in a magnetic field, and surprisingly the system with negative temperature is hotter than these with positive temperature.

For more details see the link below and the links given there.

Answer 3

No, Zero degree kelvin is the lowest attainable temperature in the physical world.

Answer 4

No. the zero point on the Kelvin scale, also known as absolute zero, is where all atomic motion stops, so zero is zero.


But in response to another's answer: At times, doesn't it seem that certain elderly drivers can somehow achieve a speed slower than stopped?

Answer 5

Zero degree kelvin is the lowest temperature. That is the reason it is called absolute temperature.

Some says that considering the spin of the particles that negative temperature is obtained.
But then the definition of temperature should be modified,

According to the present definition of temperature

Absolute zero is the lowest temperature and no negative temperature is possible.

Answer 6

No. zero is the lowest measure in temperature( in kelvin) that has been discovered till now. Nothing has been found till now who's temp. is less than 0 kelvin.

Answer 7

Nope... Zero (degree) Kelvin is the lowest attainable temperature.

Answer 8

No, the zero in Kelvin is the temperature where molecules stop moving all together, it is not possible to achieve a lower state than that.

Answer 9

It is impossible to have a temperature that is less then 0 degrees kelvin if you consider sistems in temperature equilibrium however there are a number of systems that do not have a defined temperature (spin chains and most comun laser gain mediums) that act has they had a negative temperature however it is not so they are just out of equilibrium

Answer 10

zero kelvin is achieved by taking all the energy out of a body.. Once you've taken all the energy away there is nothing left to take away...
But you never know.. Maybe sometime in the future we'll be able to get lower temps.. Maybe when all the energy is removed and then we create a "borrowed" energy situation.
PResently zero kelvin is as low as you can get.. -273.16 degrees centigrade