Is anybody aware of an equation that can be used to describe a floating ball in an air jet? http://www.ap.stmarys.ca/demos/content/fluids/bernoulli_floating_ball/bernoulli_floating_ball.html I'd just like to put numbers into an equation and prove that the forces on either side of the ball are equal. the balls mass is 2g take gravity as 9.81ms ? F=ma (0.002kg x 9.81) = 0.0196N that should be the component of force acting downwards upon the ball, would you agree? Now i'd like to find a way of calculating the force acting up on the ball, which I'd expect to be close to the figure above. Any suggestions ? I dunno if i'm on the right track because i'm a bit thick but should I be looking into the drag coefficient equation ?