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← ScienceWhich outcome occurs when rapid depressurization forces isobutane through a throttling valve?
A)Vapor fraction increases significantly✓
B)Temperature remains strictly constant
C)Isobutane behaves like ideal gas
D)Supercritical phase transition results
💡 Explanation
Depressurization causes adiabatic expansion via the Joule-Thomson effect during phase change; because throttling maintains constant enthalpy, increased vapor volume occurs. Therefore, vapor mass fraction increases rather than temperature stability or ideal gas, because this transition uses saturated fluid's phase envelope.
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