For the adiabatic process, the first law of thermodynamics is:
Correct answer: D. W = -ΔU
- A. W = ΔU = Q
- B. Q = -W
- C. Q = W
- D. W = -ΔU
Explanation
The first law of thermodynamics states that the ΔU = Q - W.Adiabatic Process: An adiabatic process is defined as a thermodynamic process where no heat is transferred into orout of the system. This means that the heat transfer (Q) is equal to zero.Derivation: By substituting Q=0 into the first law of thermodynamics equation, we get ΔU = 0 - W, whichsimplifies to ΔU = -W. This can also be written as W = -ΔU.
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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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