Energy can be converted from one form to another, but it cannot be created or destroyed. According to the rule of conservation of energy, the total energy of any isolated system (for which energy and matter transfer over the system boundary is not feasible) is constant.
deltaU=Q-W
where Delta U}\Delta U denotes the change in the internal energy of a closed system (for which heat or work through the system boundary are possible, but matter transfer is not possible), Q denotes the quantity of energy supplied to the system as heat, and W denotes the amount of thermodynamic work done by the system on its surroundings
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