What is Bernoulli's principle?
Bernoulli's principle is a principle to explain why the airplanes can get a force of lift. (For information of lift, go to what is aerodynamics.) As you know, all airplanes have wings to fly. And a shape of the wings are made to create a force of lift. Before I talk about it more deeply, I would like to talk about the Bernoulli's principle itself because the reason why a lift force is created can't be explained without understanding about it.
Bernoulli's principal states that faster moving fluids creates less pressure. Fluid means a substance that has no shape such as a gas or liquid. In this case, fluid refers to the air. When the air moves faster around the object, there would be less pressure of an object around the area where the air moves around. A good example of this is the experiment using balloons.
![Picture](/uploads/2/5/0/7/25079019/9891322.jpg)
When there are two hanged balloons like the diagram left and the movement of air between those two balloons from under those 2 such as by dryer, what do you think will happen?
1. The balloons move apart
2. The balloons pull each other
3. Nothing would happen
1. The balloons move apart
2. The balloons pull each other
3. Nothing would happen
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