Pressure
effects of gravity:
- consider little cube of fluid
- consider forces on the fluid in y direction
- weight acts down
- pressure underneath pushes up
- pressure on top pushes down
- ?Fy = -m*g + Pbottom*Abottom - Ptop*Atop = 0 , where m = ??V = ?*A*h, A = Abottom = Atop
- so: Pbottom - Ptop = ?*g*h .