Can we “shotgun” beer on the Globe?


How can beer shotgunning work if the Earth
is a globe? Hello everyone, and yes, it has come this
far! This video is in response to a comment I got
from TinyApe, asking why beer “shot-guns” work. I will quickly go through the physics of beer
“shotgunning”, and I also have a nice experiment at the end, so let’s dig in! In case you’re not familiar with it, beer
“shotgunning” is a common party trick that allows the drinker to consume a beer quicker
than usual, something like this. Let’s have a look at why this happens:
As the can drains, air must fill the void created by the draining beer. The latter creates a vacuum, and when large
enough, it will suck air in through the can opening. This is what’s known as gurgling, which happens
whenever you pour out liquid from a closed container with a small opening. See how the air bubbles go up? If we now poke a hole in the can, and then
open it on the top, the atmospheric pressure will take care of the vacuum created by the
beer draining, thus pushing it out. That’s also the reason why there’s no gurgle
anymore. So can the atmospheric pressure have such
a significant impact? To illustrate the atmospheric pressure is
real and quite powerful, I made this simple, but fun experiment, which, by the way, you
can easily reproduce at home. I filled a glass to the brim with water and
then covered it with lightweight objects, such as a cork coaster, or a plastic lid. Now, Mr Tiny also believes there’s no gravity
and objects fall because of their densities. Both the water and the lid/coaster have larger
densities than air, why don’t they fall here? The answer is due to the atmospheric pressure
exerted on the lid, which is simply larger than the pressure coming from the water in
the glass. And yes, as you can see, the hydrostatic pressure
is density, but also gravity dependent. Since gravity came up, let’s also explain
this experiment using forces instead. The pressure is force per unit area, so, by
measuring the diameter of the coaster, we find the force exerted by the atmosphere is
about 500 N. The force from the water pressure turns out to be only about 5 N, and if we
consider a weight of 100 g for the coaster, its gravity is roughly 1 N, so the air force
is considerably larger. If you want more details about gravity versus
buoyancy, I have a video just for that. So there, science can explain this little
experiment in multiple ways, how many explanations do you have for it?

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