Chemistry / Chem 1259 · Atom · ~20 seconds
Gas Density from the Ideal Gas Law
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Rearranging the ideal gas law shows a gas's density equals its molar mass times pressure, divided by the gas constant times kelvin temperature.
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At a fixed temperature and pressure, a gas built from heavier molecules is denser than one built from lighter molecules.
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Unlike a solid or liquid, a gas's density changes whenever its temperature or pressure changes, even with identical composition.