Entropy is best described as a measure of
Correct answer: B. the disorder of a system
- A. the total heat in a system
- B. the disorder of a system
- C. the temperature of a system
- D. the pressure of a system
Explanation
A system with many possible microscopic arrangements has high entropy, so melting ice or letting a gas expand into a vacuum both increase it. The second law says the entropy of an isolated system never decreases, which is what gives time its direction. Local decreases are possible, as when water freezes, but only at the cost of a larger increase elsewhere.
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About First Law of Thermodynamics
The first law relates heat supplied, work done and the change in internal energy through energy conservation. Problems use sign conventions and apply the law to isothermal, adiabatic, isobaric and isochoric processes. Internal energy is a state function, while heat and work depend on the path followed.
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