| gas constant pâyâ-ye gâzhâ (#) Fr.: constante des gaz parfaits    For a given quantity of an → ideal gas, the product of its → pressure and the → volume divided by the → absolute temperature (R = PV/T). | 
| universal gas constant pâyâ-ye hargâni-ye gâzhâ Fr.: constante universelle des gaz    Same as → gas constant. |