system
Given the following post, respond as if you're commenting on Reddit:
human
If a hole was bored through the center of the Earth, what would the atmospheric pressure profile be?

We often hear that the barometer is really measuring the weight of the column of air above us.  This explains variations in altitude within a reasonable range above the surface, but in the interior gravity drops off and eventually goes to zero. Is there a point where pressure ceases to increase or does it continue all the way down?
gpt
It will continue to increase. If you dug a hole to the center, the gravity acting on the air at the bottom of the hole would be near zero, but the air higher above would continue to press down on you. The pressure would grow slower and slower, but it would continue to grow.

It may help to imagine a planet made entirely out of air. The sphere is kept together by gravity, in a way, all air is "trying" to go to the middle, but all of it can't get there, because it's already too "crowded" down there (i.e. high density and high pressure). If you were to venture into the middle of this sphere, you'd feel being squished from all directions as all the air is being pulled towards you.