How does Bernoullis principle keep airplanes in the air?
Bernoulli’s principle. Yes, it’s hard to understand, but it really is responsible for keeping aeroplanes in the sky. Now, every time I have done something with Bernoulli’s principle, or looked it up on the internet, or found it in a book, they always have a little picture of an aeroplane flying through the sky. It shows the aeroplane in a cross-section, and it shows the wings, and the wings are shaped so that the air goes across the top of the wing faster than the bottom. The air is moving across the top of the wing, and Bernoulli said where there’s moving air there’s low pressure, so we have low pressure on top of the wing. Air on the bottom of the wing is not moving as fast, and that’s high pressure. So, that actually gives the plane lift and keeps it in the sky. Now, to go along with that, we have this little demonstration. It’s simply a pen or a pencil, and you tape a piece of paper on it, just like a 2-inch strip, and this is supposed to represent the aeroplane wing. Now, my breat
