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Weather stations typically have these following instruments: . Thermometer for measuring air and sea surface temperature; Barometer for measuring atmospheric pressure; Hygrometer for measuring humidity
1643 — Evangelista Torricelli invents the mercury barometer 1654 — Ferdinando II de' Medici, Grand Duke of Tuscany , made sealed tubes part filled with alcohol , with a bulb and stem, the first modern-style thermometer, depending on the expansion of a liquid, and independent of air pressure [ 2 ]
Barometers and pressure altimeters (the most basic and common type of altimeter) are essentially the same instrument, but used for different purposes. An altimeter is intended to be used at different levels matching the corresponding atmospheric pressure to the altitude , while a barometer is kept at the same level and measures subtle pressure ...
The 17th century saw the development of the barometer and the Galileo thermometer while the 18th century saw the development of the thermometer with the Fahrenheit and Celsius scales. The 20th century developed new remote sensing tools, such as weather radars, weather satellites and wind profilers, which provide better sampling both regionally ...
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Barely visible below the knob is a small silver plunger. This is pressed every three hours to leave a time mark on the paper. The line between two of these marks is called the 'characteristic of barometric tendency' and is used by weather forecasters. The observer would first note if the pressure was lower or higher than three hours prior.
Get the Boydton, VA local weather forecast by the hour and the next 10 days.
Measurements of barometric pressure and the pressure tendency (the change of pressure over time) have been used in forecasting since the late 19th century. [66] The larger the change in pressure, especially if more than 3.5 hPa (2.6 mmHg ), the larger the change in weather can be expected.
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