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Ideal gas law

The ideal gas law relates pressure, volume, amount, and temperature for a gas that behaves ideally. It is used to calculate volume, pressure, or amount of gas when the other quantities are known.

pV = nRT

ideal gas law

Symbols

$p$	pressure	kPa
$V$	volume	L
$n$	amount of gas	mol
$R$	gas constant, $8.314$ J/(mol·K)
$T$	absolute temperature	K

Example

1 mol of gas at 373 K and 100 kPa:

$V = nRT/p = 1\cdot 8.314\cdot 373/100 \approx 31.01$ L.

Use consistent units (kPa and L, or Pa and m³) — the gas constant

R

comes in several forms depending on unit choice.

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Part of General Chemistry: Thermochemistry and electrochemistry.