2. The gas expanding in the combustion space of a reciprocating engine has an initial pressure of 50 bar and an initial temperature of 1623 C. The initial volume is 50000 man' and the gas expands through a volume ratio of 20 according to the law pv - constant Calculate w and AU Take R= 270 JKg K and C, 800 J/Kg K. Assune n =1.38

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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.