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# Absolute Zero

An object placed in a refrigerator is made colder by the refrigerator because the refrigerator removes energy from the object. How cold can an object be? The lowest temperature possible is called absolute zero. No energy can be obtained from an object at this temperature. The pressure of a gas would be zero at absolute zero, provided the gas did not liquefy as it was cooled. By measuring the pressure of a fixed amount of gas at steam point, then at ice point, the temperature for zero pressure can be estimated. This temperature is -273°C. No matter which gas or how much gas is used, the same value is always obtained for absolute zero.

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## Definition

Absolute zero temperature is a theoretical concept, it cannot apply in practical sense. Because if a body is at absolute zero means that all heat is removed from that body. It is not practical. So absolute zero is an imaginary concept. Anyway it is a lower limit of the temperature. This statement is related to the third law of thermodynamics. So many scientists try to get more closer value of absolute zero temperature. The third law has still never been violated experimentally. It becomes more difficult to lower the temperature of a material the closer the temperature gets to absolute zero. The difficulty increases with each step to the point at which an infinite amount of work would be required to reach the very bottom of the temperature scale.