Barometer
A tool that measures air pressure
A barometer is an instrument used to measure atmospheric pressure. Atmospheric pressure is the force exerted by the weight of the air as it surrounds the earth, and is expressed in units of pressure such as millibars or inches of mercury.
There are several types of barometers, but the most common type is the mercury barometer. This consists of a glass tube filled with mercury that is inverted into a bowl of mercury, with the open end of the tube pointing upwards. The pressure of the atmosphere on the surface of the mercury in the bowl causes the level of mercury in the tube to rise or fall. The height of the mercury column is directly proportional to the atmospheric pressure.
Aneroid barometers are another type of barometer that do not use liquid. They use a small, flexible metal chamber that expands and contracts with changes in atmospheric pressure. This chamber is connected to a pointer that moves on a calibrated scale to indicate the current atmospheric pressure.
Barometers are used for a variety of purposes, including weather forecasting, aviation, and scientific research. By measuring changes in atmospheric pressure, scientists can make predictions about weather patterns and storms, and pilots can use barometers to ensure that their planes are flying at the correct altitude.
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