So today i noticed a little hole in the cap of my coffee mug.
If you cover that hole, the coffee does not flow, although there is nothing holding it back.
That is, because there is something invisible called air that is pressing it back into the cup, if it can not get other air through that little hole from outside?
Which is something that constantly confuses me (or my brain), because there is nothing there.
What would be a good illustration or an imagination, how all those pressure from around us works?
In: Physics
Ever go swimming and dive underwater? What happens as you go deeper and deeper? Do you feel the pressure? Thats because as you go deeper there’s more water above you, pushing down on you, creating more pressure. Now, on land, you have a bunch of air above you. Air is a lot lighter than water, but there is literally miles of air above you, pushing down on you. Thats air pressure, and its about 14.7 lbs of force per square inch, unless your really high up like on a mountain, then its less. Once you get up and over the air, the pressure goes to essentially 0 and thats space.
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