⚗️ Specific Gas Constant Calculator
Find the specific gas constant for a particular gas from its molar mass, useful for applying the ideal gas law in mass-based (rather than mole-based) form.
What This Calculator Does
The specific gas constant (also called the individual gas constant) is a version of the universal gas constant scaled to a particular gas’s molar mass. It lets you use the ideal gas law with mass directly instead of moles.
The Formula
The calculator uses R_specific = R_universal / M, where R_universal is 8.314 J/(mol·K) and M is the gas’s molar mass in kilograms per mole (entered here in g/mol and converted automatically). For example, dry air (M ≈ 28.97 g/mol) has a specific gas constant of about 287 J/(kg·K).
This value assumes ideal gas behavior and is commonly used in thermodynamics, HVAC, and aerospace calculations. Provided for general educational and reference purposes.