MSC Software Conservation of mass MSC.EASY5 dt (pv) out In fluid property terms 1 aP aP. dp dt out pv) x If energy transfer is ignored P 1 aP dt out-pv or the more familiar β OP EAS103 Fluid Power Systems Advanced Class-Chart 12MSC.Software EAS103 Fluid Power Systems Advanced Class - Chart 12 MSC.EASY5TM Conservation of Mass or dt d P        dt dP  T        dt dT = +  fluid property terms If energy transfer is ignored, or the more familiar in out P · Q Q V · = ( – – ) dt d (V win wout ) = –  +V in wout = w – dρ dt dV dt β V dP P · win wout V · ( – – T · = = ) – × 1 P V ρ P . ρ ρ T dt dP P · win wout V · = = ( – – ) 1 P V ρ dt P ρ β = 