This is where differs from pure thermodynamics.

In these systems, "work" is the transfer of energy through mechanical means, such as a piston moving in an engine or a turbine spinning to generate electricity.

: Methods of heat transfer including conduction, convection, and radiation, along with heat exchanger calculations. Key Features for Students Termodinamika I Termotehnika | PDF - Scribd

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: Extensive coverage of power-producing and power-absorbing cycles, such as the Rankine cycle for steam power plants and refrigeration cycles .

: The Piston noticed that if it moved quickly, the metal grew hotter; if it moved slowly, the process felt different. It learned that Work is a path function —the total energy spent depended entirely on the specific journey from the bottom of the cylinder to the top, not just where it started and ended.