Thermal Energy: The kinetic energy of molecular motion. It is measured by finding the temperature of an object.Heat: The amount of thermal energy transferred from one object to another as the result of a temperature difference between the twoFirst Law of Thermodynamics: The total internal energy E of an isolated system is constant ΔE = Efinal – EinitialState Function: A function or property whose value depends only on the present state, or condition, of the system, not on the path used to arrive at that stateExpansion Work: Work done as the result of a volume change in the system