It is possible to bring a thermodynamic system to absolute zero with finite number of operations. The above statement is ____.

It is possible to bring a thermodynamic system to absolute zero with finite number of operations. The above statement is ____.

a. True
b. False

Correct Answer : b. False

Explanation :

It is NOT possible to bring a thermodynamic system to absolute zero with finite number of operations. Suppose we have to cool some thermodynamic system to lowest possible temperature. To achieve this effect we have to insulate the system from surrounding so that the heat from surrounding must not enter the system. Further we have to perform an adiabatic transformation on the system. But adiabatic transformations are also isentropic transformations. Therefore the entropy of the system remains constant during the transformation. But entropy is not zero initially, thus the entropy will not become zero in transformation, therefore absolute zero cannot be attained.