Question

A definite zero point ___ on the absolute temperature scale but this point ___ be reached ___ violation of the second law.

Answer 1

. It is necessary to have atemperature difference to obtain work of any cycle. Explanation: It comes from the second law of thermodynamics. ... A definite zero point ___ on the absolute temperature scale but this point ___ be reached ___ violation of the second law.

Answer 2

Answer:

A definite zero point exists on the absolute temperature scale but this point cannot be reached without violation of the second law of thermodynamics.

Explanation:

• The absolute temperature scale is a temperature scale that have freezing point of water as 273.15 Kelvins and the boiling point as 373.15 Kelvins to match up with the Celsius scale.
• Reading of zero coincides with the theoretical absolute zero 0K of temperature that is where the thermodynamic equilibrium state of minimum energy.
• In other words, at T=0K the entropy is zero, which is third law of thermodynamics.
• According to 2nd law of thermodynamics, in a reversible closed system, an increment in the entropy of the system is the result of an infinitesimal transfer of heat to the system.

        $dQ=T dS$

• So both T and dS  go to zero by the third law and so a zero temperature system cannot accept or give heat.
• For an actual infinitesimal process without exchange of mass with the surroundings, the second law says the increment in entropy satisfies the inequality.

Therefore, a definite zero point exists on the absolute temperature scale but this point cannot be reached without violation of the second law.