Discussion
Across an ideal throttling valve the property that stays constant is
Answer: B
Correct answer: enthalpy
Throttling is adiabatic, involves no shaft work and produces negligible change in velocity or elevation, so the steady flow energy equation collapses to \( h_1 = h_2 \). Note what is *not* constant: the entropy rises, since the process is thoroughly irreversible, and the temperature generally changes - the Joule–Thomson effect, which is the basis of the Linde liquefaction process.
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