Illinois Weather Trivia for November 4th

Radiosondes are weather instruments that measure temperature, humidity, and barometric pressure of the atmosphere. These radiosondes are carried into the sky using weather balloons filled with helium or hydrogen. When inflated, the balloon is about 4-5 feet in diameter and several feet high. However, as the balloon ascends, the decreased effects of barometric pressure cause the balloon to expand. It will usually pop at an elevation close to 100,000 feet off the ground. By this time, the balloon is about the size of a small house. 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