Blake wrote:Welcome to CS! As a scientist, I have to point out that space doesn't suck--pressurized air pushes.
Blake wrote:Suction is a fictitious force. As you correctly pointed out, an airplane wing creates lower pressure on top and high pressure on the bottom. However, the wing doesn't rise because the air on top pulls; Both the air on top and the air on the bottom push on the wing. The higher pressure below the wing means that the air below the wing pushes harder, creating a net upward force (aka lift).
Blake wrote:Suppose you have a sealed container full of air. Air molecules are constantly slamming into the walls of the container. Each collision exerts a little bit of force. Integrating the force of all those collisions over a small area gives you the pressure. If you remove the lid in a vacuum, there will be nothing to deflect the air molecules back into the interior of the container, so they escape. As air molecules escape, they create an area of lower pressure near the lid, and the effect propagates. The net outward airflow is a result of pushing from the inside of the container, though, not pulling from the outside.
Blackicep8ntball wrote:Hmmm kinda like there is no such thing as darkness or cold; they're just the absence of light and heat respectively?
Anyway, found this article explaining the things Blake speaks of:
No such thing as suction? :-O
It's just word play really, though... if, by the word "suction", you mean air presure pushing, then there is such a thing as suction. But if, as the article explains, you mean that the void "attracts" the air, then I guess there is not.
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