Friday

April 18, 2014

April 18, 2014

Posted by **Anonymous** on Monday, March 25, 2013 at 2:02pm.

- Science -
**Steve**, Monday, March 25, 2013 at 5:17pm14.7 psi is the air pressure at the earth's surface. That is the pressure exerted by a 1-sq-in column of air reaching up to space.

The earth's atmosphere is about 300 miles thick. That air presses down everywhere with a weight of 14.7 pounds on every square inch of the surface.

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