Ideal Gas Law Calculator
PV = nRT. Enter any three known values and instantly solve for the fourth.
Pressure
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atm
Volume
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L
Moles
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mol
Temperature
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K
Pressure
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psi
Temperature
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°C
Temperature
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°F
How this was calculated
PV = nRT where R = 0.082057 L·atm/(mol·K)
P = nRT/V, V = nRT/P, n = PV/(RT), T = PV/(nR)
Conversions: 1 atm = 14.696 psi, K = °C + 273.15, °F = °C × 9/5 + 32
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Book a free strategy call →Understanding the Ideal Gas Law
The ideal gas law PV = nRT combines Boyle's Law, Charles's Law, and Avogadro's Law into one equation. It describes the behavior of an ideal gas where molecules have negligible volume and no intermolecular forces.
In petroleum engineering, the ideal gas law provides a starting point for gas volume calculations, surface/downhole conversions, and gas-in-place estimates. Real gas behavior is captured by the gas deviation factor (Z-factor): PV = ZnRT.
At standard conditions (14.696 psia, 60°F / 520°R), one mole of ideal gas occupies about 379.4 scf.
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