This quantity can take negative values at small frequencies or at large chemical potential during population inversion. (10[1])Chemical potential, volume, (10[1])and this quantity are the thermodynamic variables for the grand canonical ensemble. One over this quantity times Boltzmann’s constant equals (10[1])thermodynamic beta. (10[1])This quantity is defined using the transitivity of equilibrium in the zeroth law of thermodynamics. At constant values of this quantity, Boyle’s law states (10[1])that volume (10[1])and pressure (10[1])are inversely proportional. (10[2])For (10[1])10 points, name this quantity which is constant in isothermal processes, measured in rankine or kelvin. ■END■ (10[1])