Question

In statistical thermodynamics, entropy is defined as
1. Reversible heat transfer
2. Measure of reversibility of a system
3. Degree of randomness
4. A universal property

Answer 1

Correct Answer - Option 3 : Degree of randomness

Explanation:

Entropy:

• It can be defined as a measure of the degree of molecular disorder/randomness existing in the system.
• Among solid liquid and gas, as the randomness follows the order gas > liquid > solid, entropy also follows the same order Sgas > Sliquid > Ssolid.
• The entropy can also be stated as the energy of the system which is unavailable for doing work.

According to Second Law of Thermodynamics:

• The second law of thermodynamics says that entropy always increases with time.
• The second law states that the spontaneous process leads to an increase in total entropy.
• The total entropy increase will continue until it reaches the maximum possible value.
• The state of equilibrium is the state of the maximum total entropy.