††††A barometer measures changes in the pressure of the atmosphere. By measuring these changes, barometers can be used to help forecast the weather.
The first barometer was developed by Evangelista Torricelli in 1643. He based his work on an idea of Gallileo and used mercury in a sealed glass column. The aneroid barometer, invented in 1843, and still used today, was the first version to indicate atmospheric pressure with a dial and pointer.
