Hydraulics 1: Course notes
Consider a small static cylinder of fluid, with axis of the cylinder (s-axis) tilted at an angle θ to the vertical, z-axis. Volume of fluid element = dA ds Mass of fluid element m = ρ dA ds Resolving forces in the s-direction Gravitational force = -mg = -ρg dA ds (downwards). Pressure force (s-direction) = p dA - (p+dp) dA = - dp dA
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