Which principle is understood from the figure of the accompanying experiment? Explain the relevant principles/rules.

Which principle is understood from the figure of the accompanying ex

1.	Which principle is understood from the figure of the accompanying experiment? Explain the relevant principles/rules.
Answer» tion:Take some water in a plastic cup and hold a straw upright in it. Hold a small piece of another straw near the upper end of the first straw and perpendicular to that straw. Blow hard through the small piece of straw. You will SEE a fountain of water. Why did this happen? On BLOWING through the straw, the AIR at its OPEN end is pushed away and hence the pressure of the air at the opening goes down. As the pressure of the air near the upper end of the erect straw becomes less than atmospheric pressure, the water in the cup is pushed from where the pressure is higher to where it is lower, that is, in the upward direction, and the water comes out in the form of a fountain. The more forcefully you blow the higher will be the fountain. This straw fountain works on BERNOULLI’s principle.