Every student who studies atmospheric pressure in physics or chemistry learns the principles behind the construction of barometers. Cistern barometers, such as those found in most laboratories, consist of a long glass tube containing an inverted column of liquid having an open end in a cistern of the liquid. Students learn that the column of liquid is supported by air pressure and is equal in weight to a column of air of the same diameter.
Sullivan, Dan; Smith, Robert W.; Kemnitz, E. J.; Barton, Kevin; Graham, Robert M.; Guenther, Raymond A.; and Webber, Larry, "What is Wrong with Water Barometers?" (2010). Chemistry Faculty Publications. 13.