Sprayer - Bernoullis Principle

By Jitender Singh on Jan 2, 2021

The sprayer works on the Bernoulli's principle - the pressure drops when air speed is increased.

Procedure

Hold the refills at right angles. Immerse the vertical refill in a glass of water and blow hard through the horizontal refill. If your setup is right then water will rise in the vertical refill and sprays out in line with the direction of blow.

Discussion

Air blown through the horizontal refill creates a low pressure region at the top of the vertical refill. Higher atmospheric pressure over the surface of water in the glass forces water to rise into the vertical refill. Once water reaches its upper tip, the air stream spreads it in fine sprays.

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