| Ideal gas equation |
| The three gas laws describe the interdependence of two of the three variables namely pressure, volume and temperature, when one of them is held constant. |
| We can combine them to give a relation among all the three variables. This relation among the three variables P, V and T for an ideal gas is called ideal gas equation. |
| It is often convenient to measure amount of gas in terms of the number of moles n rather than the mass m. Since the molecular mass M is the mass per mole, the total mass m = nM. The volume of a gas varies linearly with the number of moles of the gas (at constant pressure and temperature). The ideal gas equation, derived for the volume of one mole of gas in order to get the constant in the general gas equation, is same for all gases. |
| Hence the general Ideal Gas Equation becomes |
| PV = nRT |
| where R is a constant called universal gas constant. |
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