Barometer
Barometer
A Barometer (/bəˈrɒmɪtər/; from Greek baros, 'weight' and metron, 'measure') is a scientific instrument used in meteorology to measure atmospheric pressure. Pressure tendency can forecast short term changes in the weather. Many measurements of air pressure are used within surface weather analysis to help find surface troughs, high pressure systems, and frontal boundaries.
Etymology
The word "barometer" is derived from the Greek words baros meaning weight, and metron meaning measure. It was first invented in 1643 by the Italian scientist Evangelista Torricelli.
Types of Barometers
There are two primary types of barometers: mercury and aneroid.
- Mercury Barometer: This type of barometer uses a column of mercury to measure air pressure. It was the first type of barometer to be developed and is considered to be the most accurate.
- Aneroid Barometer: This type of barometer uses a small, flexible metal box called an aneroid cell to measure air pressure. It is more portable and safer than the mercury barometer, but it is also less accurate.
Related Terms
- Atmospheric Pressure: The pressure exerted by the weight of the atmosphere, which at sea level has a mean value of 101,325 pascals (roughly 14.696 pounds per square inch).
- Meteorology: The scientific study of the atmosphere that focuses on weather processes and forecasting.
- Weather Forecasting: The application of science and technology to predict the conditions of the atmosphere for a given location and time.
- Evangelista Torricelli: An Italian physicist and mathematician, and a student of Galileo, who is best known for his invention of the barometer.
External links
- Medical encyclopedia article on Barometer
- Wikipedia's article - Barometer
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