Any attainable value of absolute temperature is

Any attainable value of absolute temperature is ________

a. always less than zero
b. always equals to zero
c. always greater than zero
d. none of the above

Correct Answer: c. always greater than zero

Explanation:

It is impossible for a system to undergo a reversible isothermal process without transfer of heat. To make this process possible, the temperature required is an absolute zero temperature and the second law of thermodynamics is also violated. Thus any attainable value of absolute temperature is always greater than zero. This is also called as third law of thermodynamics. It states that it is impossible for any process to reduce any system to an absolute zero temperature in a finite number of operations.