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A non liquid barometer is called Aneroid barometer. It is preferred over mercury barometer because of its smaller size and convenience. This is the main reason why Aneroid barometer is preferred over mercury barometer. But mercy barometer is used to calibrate and check mercury barometer.
Weather forecasters use a special tool called a barometer to measure air pressure. Barometers measure atmospheric pressure using mercury, water or air. … Forecasters use changes in air pressure measured with barometers to predict short-term changes in the weather.
(Or mercurial barometer; formerly called Torricelli’s tube.) The basic construction, unchanged since Torricelli’s experiment in 1643, is a glass tube about three feet long, closed at one end, filled with mercury, and inverted with the open end immersed in a cistern of mercury. …
An instrument that is used to measure air pressure. A barometer that consists of a glass tube open at the bottom end and partially filled with mercury. … When the air pressure increases, it presses down more on the surface of the mercury. Greater air pressure forces the column of mercury higher.
Hold the instrument at the 45-degree angle and check the the level of the mercury in the glass tube with a long “stick” barometer. If the barometer is working correctly, the mercury inside will rise quickly to fill the very tip of the tube, leaving no air bubble.
The barometer is one of the most important instruments in weather forecasting. It is used, as the name suggests, to measure localized atmospheric air pressure. Evangelista Torricelli is widely credited with the invention of the barometer in the mid 17th Century.
The central pressure of a shallow low is above 1000 hectopascals (hpa), of a moderate low 980-1000 hpa, and of a deep or intense low below 980hPa.
While an inside or outside wall won’t make a difference in your barometer’s performance, placing it too near a heat source may. Situate your barometer so that it is not near a heating vent or sitting in direct sun. This is especially important if your barometer is also a combination thermometer.