Negative temperature : A part from the system i.e., the nucleus of a solid can have a negative temperature. This sub-system is considered isolated from the main system.
The specific heat of the subsystem tends to zero at high temperature. A small amount of heat energy tends to raise the temperature of the sub-system to infinitely. It is possible to add still more energy to the sub-system at infinity and force the sub-system into the negative temperature region.
The negative temperature are hotter than the positive temperature. (-0) is the hottest temperature and (+0) is the coldest temperature.
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