What Is the Value of R (Gas Constant)?

The gas constant, symbolized as R, is a fundamental physical constant used in the ideal gas law (PV = nRT). Its value depends on the units used for pressure, volume, and temperature:

Common Values of R

Ideal Gas Law

• Equation: PV = nRT
  • P = Pressure
  • V = Volume
  • n = Number of moles
  • R = Gas constant
  • T = Temperature (Kelvin)

Significance

• The gas constant bridges the relationship between the macroscopic properties of gases and the amount of substance.
• It is used in calculations involving pressure, volume, temperature, and the number of moles of a gas.

Conclusion

The most widely accepted value of R in SI units is 8.314 J·mol⁻¹·K⁻¹. Always ensure unit consistency when applying the gas constant in calculations.