The discussion clarifies the conventions surrounding the sign of work done by a system in thermodynamics, highlighting that both positive and negative designations are valid depending on the context. In the equation for the first law of thermodynamics, if expressed as ΔU=Q-W, work (W) is defined as the work done by the system on the surroundings, resulting in a negative value. Conversely, if the equation is written as ΔU=Q+W, W represents the work done by the surroundings on the system, leading to a positive value. Consistency in the chosen convention is essential for accurate calculations.
PREREQUISITESStudents of chemistry and physics, educators teaching thermodynamics, and professionals involved in energy systems or physical chemistry who require a clear understanding of work conventions in thermodynamic equations.