1. Derive the equation of continuity in cylindrical coordinates. Hint: The starting point is to consider the differential volume element shown in Figure 1. The velocity vector in cylindrical coordinates is given by v=vre^r+vze^z+ve^. The final equation should be given by r1r(rvr)+r1(v)+z(vz)+t=0 1. Derive the equation of continuity in cylindrical coordinates. Hint: The starting point is to consider the differential volume element shown in Figure 1. The velocity vector in cylindrical coordinates is given by v=vre^r+vze^z+ve^. The final equation should be given by r1r(rvr)+r1(v)+z(vz)+t=0