Work is performed on the system during the lower isentropic compression process.
2.
This can be measured at isentropic compression, resulting in a slight temperature increase ( in addition to the pressure increase ).
3.
The Otto cycle consists of isentropic compression, heat addition at constant volume, isentropic expansion, and rejection of heat at constant volume.
4.
For example you can raise the temperature while pressure is kept constant, or you can raise the temperature while volume is kept constant, or you can change temperature by isentropic compression or expansion, and so on.
5.
By comparing the three internally reversible processes compressing an ideal gas from P _ 1 to P _ 2, the results show that isentropic compression ( Pv ^ k = constant ) requires the most work in and the isothermal compression ( T = constant or Pv = constant ) requires the least amount of work in.
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