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High-speed winds are always followed by reduced air pressure.
A boy blowing into a bottle
This difficulty is because the air near the mouth has higher speed, with a decreasing air pressure, when the air is blown into the mouth of the bottle. The air pressure near the mouth is lower than the pressure inside the bottle. Due to this high pressure inside the bottle, the paper ball comes out.
Even if the same is tried with bottles of different sizes, the paper comes out of the bottle due to the pressure inside.
Even if the same is tried with bottles of different sizes, the paper comes out of the bottle due to the pressure inside.
Blowing a balloon:
Two balloons of equal sizes are filled with a little amount of water. Then the balloon is blown, and the ends are tied with a string. The balloons are hanged on a stick at \(8\)\(–\ 10\) \(cm\) apart. When the air is blown in between the two balloons, they move towards each other. This movement occurs due to the reduced air pressure between them. The pressure outside the balloons pushes them towards each other, where the low air pressure is created.
A boy blowing between the balloons
Lifting the paper:
A paper strip of \(20\ cm\) long and \(3\ cm\) wide is taken between your thumb and forefinger. When the air is blown over the paper, it went upwards. Again, if the air is blown over the paper, the air pressure gets reduced above the strip.
A boy blowing over the paper
The movement of air is always from the region of higher air pressure to the region of lower air pressure. The air moves with a higher speed, if there is a greater pressure difference.
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