If a small ping pong ball is placed in a...

If a small ping pong ball is placed in a vertical jet of water or air, it will rise to a certain geight above the nozzle and will be spinning there.

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If a small ping pong ball is placed in a vertical jet of water the high velocity of water jet takes the ball upwards along with it through a certain height. Due to high velocity of jet of water, the pressure between the ball and the jet of water decrease i.e. becomes less than atmospheric pressure, therefore , this pressure difference pushes the ball against the jet and the ball remains suspended.
Now jet of water exerts a tangential force on the surface of ball. Due to it, the ball spins.

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