What are the instances when you have experienced the motion of air?
Answers
Answer:
☆ FLIGHT BEGINS WITH AIR IN MOTION ☆
As an airplane moves through the air, its wings cause changes in the speed and pressure of the air moving past them. These changes result in the upward force called lift. To understand lift, you first have to understand how air (a gas) behaves under certain conditions.
☆BERNOULLI PRINCIPLE☆
Let's start with the Bernoulli principle. The Bernoulli principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in the pressure exerted by the fluid.
☆ WHY DOES THE AIR SPEED UP? ☆
When moving air encounters an obstacle—a person, a tree, a wing—its path narrows as it flows around the object. Even so, the amount of air moving past any point at any given moment within the airflow is the same. For this to happen, the air must either compress or speed up where its flow narrows. While air can be compressed more easily than water, freely flowing air acts much like water—at least at relatively low speeds. So when you "squeeze" a stream of air, two things happen. The air speeds up, and as it speeds up, its pressure—the force of the air pressing against the side of the object—goes down. When the air slows back down, its pressure goes back up.
Why does the air speed up? Because of conservation of mass, which states that mass is neither created nor destroyed, no matter what physical changes may take place. This means that if the area in which the air is moving narrows or widens, then the air has to speed up or slow down to maintain a constant amount of air moving through the area.
☆ WHY DOES THE AIR PRESSURE GO DOWN? ☆
For a stream of air to speed up, some of the energy from the random motion of the air molecules must be converted into the energy of forward stream flow. The random motion of air molecules is what causes air pressure; so transferring energy from the random motion to the stream flow results in lower air pressure.
Explanation:
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When flowing air comes into contact with an object—a person, a tree, or a wing—its path narrows as it flows around the barrier. Regardless, the quantity of air travelling past each location in the airflow at any given time is the same. The air must either compress or speed up where its flow narrows in order for this to happen. While air is more readily compressed than water, freely flowing air behaves similarly to water—at least at low speeds. Two things happen when you "squeeze" a stream of air. The air accelerates, and as it accelerates, the pressure—the force of the air pressing against the object—decreases. When the air slows down again, the pressure rises again.
The air travelling over and under a wing is curved and inclined in such a way that the air moving over it is quicker than the air moving under it. The pressure of air decreases as it accelerates up.