One approximation of this quantity involves taking the limit of the integral [read slowly] “x to the fourth times e to the x, [pause] over the quantity e to the x minus one squared” in a model of this quantity that sets a namesake temperature proportional to the cube root of “six pi squared times number density”. Einstein’s model of this quantity (10[1])with a lattice of 3D QHOs fails to account for the cubic temperature dependence of this quantity observed in (10[1]-5[1])the Debye (“duh-BYE”) model. This quantity’s high-temperature value is three times the ideal gas constant according to the Dulong–Petit law. The adiabatic index is the ratio (-5[1])between this quantity’s constant-volume and constant-pressure forms. For 10 points, one (-5[1])calorie per gram per degree Kelvin is water’s value of what quantity, which measures how much heat it (10[1])takes to increase an (10[1]0[1])object’s temperature? ■END■