1

**Physics, Astronomy & Cosmology / Re: How does the length of a tunnel, at constant depth, vary with length?**

« **on:**25/12/2009 16:33:46 »

Offhand, I don't see why the regular barometric equations wouldn't work. You're talking about a tunnel into the earth and the pressure at various depths, right?

I don't know if it would apply. I'm assuming the tunnel is at a constant level.

Let's assume that this tunnel is in construction and only has one entrance and no traffic is yet going through it. if you needed to ventilate the area for workers while trying to remain efficient you would need to calculate how the pressure inside the tunnels are affected by its growing length. As mentioned breathable air at some point will not be able to reach the end of the tunnel at some point. So what factors must be taken into account and what are the existing formulas that would fit into this?

thanks guys, the dialog is inspirational so far.