Question

Describe an experiment to show that increased wind speed leads to reduced air pressure.

Answer 1

Hold a strip of paper about 2 cm wide between the forefinger and the thumb of the hand and blow air over its top. Make sure that the fingers do not obstruct the flow of air over the paper strip. It is observed that instead of going down, the far end of the paper begins to lift upwards. The harder the air is blown, the higher it will lift. This happens because when air is blown over the paper, the air pressure above the paper reduces. The air pressure below the paper remains the same. As the pressure below is now greater than that above the paper, it pushes the paper above.