Concept explainers
(a) To Determine:
How does the entropy of the gas change if the gas expands adiabatically?
Answer to Problem 18Q
Solution:
Entropy of the gas remains constant when it expands adiabatically.
Explanation of Solution
In an adiabatic process, . So, by the formula, the value of is zero which implies that the entropy of the gas remains constant if the gas expands adiabatically.
(b) To Determine:
How does the entropy of the gas change if the gas expands isothermally?
Answer to Problem 18Q
Solution:
Entropy of the gas increases when it is isothermally expanded.
Explanation of Solution
In an isothermal expansion of gas, the temperature of the system is constant which implies that the internal energy of the gas is constant and as gas expands it works on the surroundings. Then by first law of
Chapter 15 Solutions
Physics: Principles with Applications
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