This quantity is conserved in an ideal Hampson–Linde cycle, which is used in the liquefaction of gases. At a constant value of this quantity, hydrogen, helium, and neon warm (-5[1])upon expansion because they have very (10[1])small inversion temperatures. The differential for this quantity is equal to “T dS + V dp” (-5[1])when (10[1])particle number (-5[1])is held constant. (10[2])Throttling processes (10[3]-5[1])conserve (10[1])this quantity via the Joule–Thomson (10[2])effect. (10[2])In the thermodynamic square, (-5[1])this quantity is the only non-energy potential. Along with energy, the Born–Haber cycle calculates a “lattice” (10[1])version of (10[1])this quantity (10[2])from (10[2])Hess’s (10[1])law. (-5[1])This quantity, (10[1]-5[1])equal to the sum of the internal energy (10[1])plus (10[1])pressure times volume, is (10[1])negative for exothermic processes. (10[3]-5[3])For 10 points, name this state function denoted H. (10[3])■END■ (10[6]0[2])