A barometer is the scientific instrument used by meteorologists to measure atmospheric pressure. There are three main types of barometers: mercury, aneroid and digital barometers.Continue Reading
A basic mercury barometer consists of a single open-ended glass tube and a reservoir. The glass tube is filled with mercury and is placed upside down in the reservoir, which also has mercury in it. The mercury level in the tube drops, creating a vacuum at the top. The barometer functions by balancing the weight exerted by the atmospheric pressure against the weight of the mercury in the glass tube. An aneroid barometer typically has a sealed metal chamber that contracts and expands based on the surrounding atmospheric pressure. A mechanical tool is used to measure how much the chamber contracts or expands. Digital barometers use electrical charges to accurately measure and display complicated atmospheric data.
A change in atmospheric pressure directly affects the weather. Meteorologists use barometers to forecast short-term weather changes. Atmospheric pressure that rises slowly, over a week, is usually an indication of settled weather that will likely last for a long time. An unexpected drop in atmospheric pressure within a few hours typically indicates an approaching storm, which will likely last a short period of time, accompanied by strong winds and heavy rain.Learn more about Atmosphere
The weight that the atmosphere exerts as it pushes downward causes atmospheric pressure. This pressure in the Earth's atmosphere affects the weather.Full Answer >
Air pressure, the force exerted on a mass by the weight of air particles, is measured in either inches of mercury or in millibars, represented by inHg and mb, respectively. One standard atmosphere, represented by the symbol atm, is equal to 29.92 inHg, or 1013.25 mb.Full Answer >
A barometer is used to measure atmospheric pressure. Atmospheric pressure is a measure of the amount of force air exerts onto the earth as it is pushed down from the atmosphere. Another term for atmospheric pressure is barometric pressure.Full Answer >
A fishing barometer is a device that measures atmospheric pressure. It operates like any other barometer, with the added benefit of displaying whether or not conditions are ideal for fishing.Full Answer >