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When solving otto or diesel cycle question with variable specific heats, we use the relative specific volumes, but when

Posted: Sat May 21, 2022 10:02 am
by answerhappygod
When solving otto or diesel cycle question with variable
specific heats, we use the relative specific volumes, but when
solving brayton cycles we use the relative specific pressures. Why
is it that we use the relative pressures for the brayton cycle
instead of the relative volume like in Otto or Diesel cycles?