absolute zero 
noun
The lowest temperature that is theoretically possible, at which the motion of particles which constitutes heat would be minimal. It is zero on the Kelvin scale, equivalent to −273.15°C.The third law of thermodynamics states that for a perfect crystal at a temperature of absolute zero on the Kelvin scale the entropy value is zero....
- In doing so, he devised a more fundamental way of defining the absolute zero of temperature, independent of any particular material substance.
- At absolute zero the internal energy of the system would be zero since temperature is proportional to internal energy.
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