An infinitesimal change in this quantity is equal to TdS - PdV.
A perfect elastomer may be defined as a polymer in which this quantity is independent of the extension of the random coil. An infinitesimal change in this quantity is equal to TdS - PdV. The slope of this quantity over temperature yields the heat capacity at constant volume; also like temperature, this state function remains constant in an isothermal process. For a monatomic ideal gas, this quantity is equal to 3/2 times nRT. When the product of PV is added to this quantity, (*) enthalpy is obtained. If the system is isolated, this quantity cannot change via the first law of thermodynamics, which gives it as the sum of the heat and work done on a system. For 10 points, give this measure of the total amount of energy possessed by a thermodynamic system, symbolized U.
A perfect elastomer may be defined as a polymer in which this quantity is independent of the extension of the random coil.
internal energy [prompt on U until mentioned; accept just internal after "energy" is mentioned]