Which gas law explains why an aerosol spray can feels noticeably colder when gas is rapidly discharged?
Answer and explanation
Correct answer: D. Joule-Thomson adiabatic expansion effect
- Step 1: Rapid discharge of gas through a narrow nozzle occurs adiabatically with no time for heat exchange with surroundings.
- Step 2: As real gas molecules expand against intermolecular attractive forces, internal energy is consumed, causing a temperature drop known as the Joule-Thomson cooling effect.
Answer
Joule-Thomson adiabatic expansion effect.
Why not the others: 'Boyle's law' assumes constant temperature; 'Dalton's law' sums partial pressures in a mixture; 'Avogadro's hypothesis' relates volume to moles of gas.
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