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- first law of thermodynamics
- A formal statement that energyA system's capacity to do work. can neither be created nor destroyed; as applied to chemical systems, the change in internal energyA thermodynamic function corresponding to the energy of a system; represented by the symbol U or E. is equal to the heatEnergy transferred as a result of a temperature difference; a form of energy stored in the movement of atomic-sized particles. energy transfer into the system plus the workA mechanical process in which energy is transferred to or from an object, changing the state of motion of the object. energy transfer into the system.