A constant characterizing these substances equals the difference between two types of heat capacity, per Mayer’s relation. These substances do not change temperature while undergoing a Joule expansion. A fugacity coefficient of 1 characterizes these substances, (10[1])which have a value of 0 for the “b” coefficient measuring excluded volume (10[2])in the van der Waals equation. Avogadro’s number times the Boltzmann constant equals a constant named for these substances, which are typically assumed (10[1])to have no (10[1])intermolecular forces. (10[1])For 10 (10[1])points, (10[1])8.314 joules per mole-kelvin (10[1])is the value of a constant named for what substances, governed by the equation “PV equals nRT”? ■END■