An Ideal Gas, initially at a pressure of 800 kPa, is compressed from 1.5 litres to 0.4 litres. The compression process is polytropic, with a polytropic exponent (n) of 1.14.
If the mechanical efficiency of the process is 81 %, calculate the work input to the piston (work done on the piston), in kJ, during the compression process.