308800 Chapter Notes - Chapter 4: Inexact Differential, Process Function, Joule

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6:09 pm: understand definitions of work and heat. Units for work: unit for work is joule (j) or kilojoule (kj, power: rate of doing work, 1 j/s = 1 watt (w) Work done at the moving boundary of a simple compressible system: therefore, work is considered the integral of pdv, or the area under the curve of a pressure- Volume graph: as this depends on the path that is undertaken to get from state 1 to state 2, work is said to be a path function or an inexact differential. There must be a path for heat transfer; the bodies may not be insulated. There must be time allowed for heat transfer; eg. hopping on a hot surface allows less time for the heat to transfer to your feet.

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