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quote:Originally posted by DoctorBeaverI thought gravity always acted as if it was coming from the centre of an object
quote:Originally posted by DoctorBeaverSorry but I can't resist it... if the tunnel was narrow there wouldn't be MUSHROOM for him to move about*hangs head in shame* [V]Veni, Vidi, Velcro. I came, I saw, I got stuck.
quote:Originally posted by another_someoneI assume that all of you are discussing what happens if he drops through from the north or south pole, otherwise the rotation of the Earth would have him bouncing off the side of the tunnel.
quote:Originally posted by A Big MugGood point. I thought I had a bead on how to calculate the increase in air pressure with depth but alas it was to no avail. I was hoping a mining site would have some type of calculation available. The other item I was hoping to find is the the number of atmospheres of pressure that air would turn to liquid. It seems like the pressure toward the middle of the tunnel might be sufficient. I wish now I had paid more attention in every single class I ever took in school. Ever wish you could go back and do it again? I do.
quote:Originally posted by hderyckeIsn't air pressure related to gravity? As you enter the atmosphere and go down, pressure increases because you have more and more air on top of you, which is being pulled towards the planet. But once you breach the surface, the gravitational pull on the air decreases, all the way to zero once you're at the center (or at least, the gravitational pull of the surrounding planet cancels out).
quote:Originally posted by another_someoneAnd how do you propose that the air pressure beneath the surface layer that has already accumulated above your head is dissipated?
quote:Air pressure is created by the accumulated downward force of the air above you. That gravity beneath the surface of the Earth is less than that above the surface of the Earth would mean that there is less additional pressure to accumulate than might otherwise be, but in the absence of an upward force, you would still be subject to the full downward force that has already been accumulated by the weight of air above you.