Science & Energy
Ideal Gas Law
Updated 2025-09-19
Definition
PV = nRT, relating pressure (P), volume (V), moles of gas (n), the universal gas constant (R = 8.314 J/mol·K), and temperature in Kelvin (T). The equation combines Boyle's, Charles's, and Avogadro's laws into a single relationship. Real gases deviate at high pressures and low temperatures, where intermolecular forces matter. The ideal gas law is exact enough for most chemistry, HVAC, and scuba-diving calculations, it predicts, for example, that a sealed rigid container of air will experience a 7% pressure increase when heated from 20°C to 40°C.
Primary source: NIST gas constant
Related Calculators
- Ideal Gas Law Calculator (PV=nRT) - Calculate pressure, volume, temperature, or moles using the Ideal Gas Law.
- Molarity Calculator - Calculate the molarity of a solution from moles of solute and volume of solution.
- Density Calculator - Calculate density, mass, or volume using the formula density = mass / volume.