For steady flow V·()=0 For incompressible flow vv-0 Example 1 Under what conditions does the velocity field V=(a,x+b,y+Cz)i+(a,x+6,y+c22)j +(asx+bay+crzk represents an incompressible flow which conserves mass?( where ai,bi,c=const8 For steady flow  = ( ) 0 V For incompressible flow V = 0  Example 1 Under what conditions does the velocity field 1 1 1 2 2 2 3 3 3 ( ) ( ) ( ) V a x b y c z i a x b y c z j a x b y c z k = + + + + + + + + represents an incompressible flow which conserves mass? ( where ) , , a b c const iii =