![]() In the context of physics, the common scenario is one of adding heat to a volume of gas and using the expansion of that gas to do work, as in the pushing down of a piston in an internal combustion engine. It is just that W is defined as the work done on the system instead of work done by the system. It is the same law, of course - the thermodynamic expression of the conservation of energy principle. It is typical for chemistry texts to write the first law as ΔU=Q+W. The standard unit for all these quantities would be the joule, although they are sometimes expressed in calories or BTUs. ![]() It is used extensively in the discussion of heat engines. ![]() The first law makes use of the key concepts of internal energy, heat, and system work. The first law of thermodynamics is the application of the conservation of energy principle to heat and thermodynamic processes: First Law of Thermodynamics First Law of Thermodynamics
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