CHEG 2111 Lecture Notes - Lecture 7: Ideal Gas, Continuously Variable Transmission
6 Feb 2019
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For a given temperature, reducing the pressure we can reach the point where vapor is created (saturated liquid) A gas can go from one stage to another via different process. Assume ideal gas when p is very low and t is high. Adiabatically and isothermally are different : isothermally, heat (q) can change. How do we find the properties of an ideal gas at each stage of a process and how can we calculate energy or heat needed for different processes. H = cpdt h = cpdt = 0. U = cvdt u = cvdt = 0. W = - pdv w = - pdv. W = - rt/v * dv -rt dv/v w = -rtln(v2/v1) = -rtln[(rt/p2)/(rt/p1)] = -rtln(p1/p2) U = q + w q = -w b/c du = 0. U = cvdt u = cvdt = cv t. H = cpdt h = cpdt = cp t.
