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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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