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Air Pressure half as mile underground

  1. Mar 13, 2015 #1
    Years ago, I went to an Iron mine in Minnesota, and we took an elevator half a mile underground. Why wasn’t the air pressure down there stiffling?
     
  2. jcsd
  3. Mar 13, 2015 #2
    To keep everything safe, pressure regulators are displaced in mines. It is used to regulate the air pressure there so that miners working extended hours won't feel sick. ( There are quite a number of cases before where miners fell ill because of this.) The principle behind this is just like the cabin pressurization in airplanes, just the opposite of that.
     
  4. Mar 13, 2015 #3

    sophiecentaur

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    1/2 mile (only 800m) above ground is hardly a big deal so why would 1/2 mile under the ground be?
     
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