Bronchoconstriction and mucus cause an Air flow reduction of 625 times.
The presence of air is the main reason for airflow. Because of the fluid behavior of air, particles naturally move from regions of higher pressure to those of lower pressure. Altitude, temperature, and composition are all directly correlated with atmospheric air pressure.
A fluid, air is similar to water. In the open air, air moves from a higher pressure to a lower pressure because of the difference in pressure between the two areas. A wind is a flow of air from a region of higher pressure to one of lower pressure.
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