When water is poured, the air column becomes shorter. Continue to pour water, and the water flow makes the air flow downward, thus forming the change of air flow.
Therefore, the more water is poured, the less space is left in the bottle.That is, the air column in the bottle is getting shorter and shorter.
features
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The air column has no definite shape. It is flowing (just like water, it will look like water in any container).
Resonance experiment
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Make two paper drums.The armour paper cylinder has a bottom and is slightly thicker;B paper cylinder is a tube that can be inserted into A cylinder and moved forward and backward.Find a tuning fork, use a rubber hammer to sound the tuning fork, make the tuning fork being sounded align with the cylinder mouth, extend or shorten the paper cylinder, and you will find that when the paper cylinder just reaches a certain length, the sound is the loudest.If there is no tuning fork, you can also use the bell cover of the bicycle bell, but you need to clamp it with pliers[1]The screw in the bell cover shall not contact with other objects.This is the air column resonance experiment.The longer the air column,wavelengthThe longer, the lower the frequency;The shorter the air column,wavelengthThe shorter, the higher the frequency.
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Above the weak low pressure, the difference in wind direction and speed between high and low altitude is smaller.In this case, the upper and lower air columns act in unison, and the heat in the upper air is easy to accumulate, thus warming up.Once a cyclone is generated, the ambient air flow above the friction layer will flow along the isobars, and the warming effect of the upper layer can be further completed.In the area north of 20 ° n, the climate conditions have changed, mainly because the high level wind is strong, which is not conducive to warming[2]Typhoons are not easy to appear.tropical stormIf you continue to strengthentyphoon。
