Chemistry / Unit 7 Chem 1336 short lesson, about 20 seconds
Conditions Favoring Ideal Behavior
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The idea
A real gas behaves most nearly ideally at low pressure and high temperature, where molecules sit far apart, moving too fast for attraction to matter.
In practice
Helium at room temperature and atmospheric pressure has a compressibility factor extremely close to 1.
Where people slip
Low pressure and high temperature are both required — a cold, low-pressure gas can still deviate if it is near condensing.
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