The thermodynamic variable used to express the second law is denoted by S. It is:
AEnvelope
BEntropy
CEnthalpy
DEnergy
Answer & Solution
Correct answer: B. Entropy
1. Enthalpy uses the letter H.
2. This one uses the letter S.
3. That variable is entropy.
_Source: OpenStax University Physics Volume 2, Chapter 4, The Second Law of Thermodynamics._
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