The barometer is an instrument for measuring atmospheric pressure. The pressure indicated can aid in predicting short term weather.
There are two main types of barometer in use, the mercury barometer, which can either be in the form of a "stick" or a "wheel", and the aneroid barometer, a later invention and most commonly available.
Italian Evangelista Torricelli, an associate of Galileo, is generally credited with inventing the mercury barometer in 1643. Galileo suggested to Evangelista Torricelli that he use mercury in his vacuum experiments.
A mercury barometer has a glass tube with a height of at least 84 cm, more...
An aneroid barometer is a type of barometer that measures atmospheric pressure using a small, flexible metal container called an aneroid cell, rather than using a fluid such as mercury. The aneroid cell is sealed and partially evacuated of air, so that a change in atmospheric pressure will cause it to expand or contract. This expansion or contraction is transmitted through a series of mechanical linkages to a pointer that moves on a calibrated scale, indicating the atmospheric pressure. Aneroid barometers became popular from the late 19th century, and are commonly used in weather forecasting, as changes in atmospheric pressure more...
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