How Buildings Stack Up

Source: / Joseph W. Lstiburek, Ph.D., P.Eng., Fellow ASHRAE
We live at the bottom of an ocean of air. Each of us is carrying around 14.7 pounds per square inch when at the beach in Miami. We are powerful creatures indeed. Imagine carrying around 101,000 Pascals on that beach. Or 1,010 millibars. As elevation increases, the weight of the air we are carrying around decreases. This decrease in weight with elevation is called the lapse rate. Read more here.
©2014 This excerpt taken from the article of the same name which appeared in ASHRAE Journal, vol. 56, no. 2, February 2014.