Chemistry / Unit 7 Chem 1259 short lesson, about 20 seconds
Gas Density from the Ideal Gas Law
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The idea
Rearranging the ideal gas law shows a gas's density equals its molar mass times pressure, divided by the gas constant times kelvin temperature.
In practice
At a fixed temperature and pressure, a gas built from heavier molecules is denser than one built from lighter molecules.
Where people slip
Unlike a solid or liquid, a gas's density changes whenever its temperature or pressure changes, even with identical composition.
Your place on the trail
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