Under which conditions does a real gas approximate to an ideal gas?
Correct answer: B. Pressure = low density = high
- A. Pressure = high density = high
- B. Pressure = low density = high
- C. Pressure = high density = low
- D. Pressure = low density = low
Explanation
The physically correct condition is low pressure and high temperature, which corresponds to low density. Option B is the most accurate description.
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About Real and Ideal Gases
An ideal gas is modelled as particles with negligible volume and no intermolecular attraction, obeying Boyle's, Charles's and Avogadro's laws through PV = nRT. Real gases deviate from this behaviour, especially at high pressure and low temperature, because particle volume and attractive forces matter; the van der Waals equation explains these corrections.
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