Loss of mass in the cv op ydvdz Ot a(pu dxdydz+o(pv) dxdydz (p) dxdyd az at at a(pu) dxdydx+ a(pv dxdydz a(pr OX Bp, d(pu) a(pv)*20 ),a( +V·(p)=0 at ax at p dp a Av.=0 dp+pv.V=0 dt7 ( ) ( ) ( ) u v w dxdydz dxdydz dxdydz dxdydz x y z t         + + = −     ( ) ( ) ( ) 0 u v w t x y z         + + + =     ( ) 0 V t    +   =  u v w V 0 t x y z          + + + +  =     + V = 0 dt d    Loss of mass in the CV dxdydz t  −  ( ) ( ) ( ) 0 u v w dxdydz dxdydz dxdydz dxdydz t x y z         + + =    