Steam at a pressure of 21 bar and a dryness fraction of 0.9 occupies a volume of 0.427 m3 in a cylinder behind a piston is allowed to expand reversibly to a pressure of 7 bar according to the relationship, PV1.25 = Constant. Sketch the process on the p-v diagram and calculate the work and heat transfers in kJ.

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Units and Dimensions

Dimensions are the basic concepts of the measurement of quantities. Units are the means of expressing the dimensions. For instance, an area has a dimension of L2 and a unit of m2.