Illinois Weather Trivia for October 27th

Atmospheric pressure is measured with a device known as a barometer. The standard barometer consists of a long glass tube, one end closed and the other end inserted in a dish of mercury. The weight of the atmosphere pushes down on the dish, causing the mercury to rise or fall in the tube. Typically, the height of the mercury in the tube will range from 29 to 31 inches; this is where the term "inches of mercury" comes from when relating barometric pressure. is the U.S. government's official web portal to all federal, state and local government web resources and services.
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  • Page last modified: 13-Sep-2010 5:47 PM UTC