Concepts of Physics

IIT JEE Physics (1978-2018: 41 Years) Topic-wise Complete Solutions

To understand working of sprayers

Objective

To understand working of the sprayers.

Introduction

Many household sprayers work on Bernoulli's principle. Make an atomizer to know how they work.

Apparatus

two empty refills and a glass full of water.

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.

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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.