a) If the expansion is carried out isothermally and reversibly, calculate Q. W, AH and AU. Draw the process on a pV diagram. Label the axis and the path clearly. b) If the expansion is carried out adiabatically and reversibly, calculate Q, W, AH and AU. Draw the process on a pV diagram. Label the axis and the path clearly.

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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.