<P> Therefore, work - consuming devices such as pumps and compressors (work is negative) require less work when they operate reversibly . </P> <P> isentropic process: involves no cooling, polytropic process: involves some cooling isothermal process: involves maximum cooling </P> <P> By making the following assumptions the required work for the compressor to compress a gas from P 1 (\ displaystyle P_ (1)) to P 2 (\ displaystyle P_ (2)) is the following for each process: Assumptions: </P> <Dl> <Dd> P 1 (\ displaystyle P_ (1)) and P 2 (\ displaystyle P_ (2)) </Dd> </Dl>

Who proposed a portable home consisting of a machine generating a bubble of compressed air