6/16/2023 0 Comments Anemometer for kids![]() In 1844, the French scientist Lucien Vidi invented the aneroid barometer. Observers can tell what the air pressure is by looking at where the mercury stops in the barometer. The tube is marked with a series of measurements that track the number of atmospheres or bars. As the pressure increases, it forces the mercury up the tube. The mercury in the tube will adjust itself to match the atmospheric pressure above the dish. The mercury sits in a circular, shallow dish surrounding the tube. At the bottom of the tube is a pool of mercury. In order to keep his experiments more secretive, Torricelli deduced that he could create a much smaller barometer using mercury, a silvery liquid that weighs 14 times as much as water.Ī mercury barometer has a glass tube that is closed at the top and open at the bottom. ![]() ![]() Torricelli’s water barometer was more than 10 meters (35 feet) in height, which rose above the roof of his home! This odd device caused suspicion among Torricelli’s neighbors, who thought he was involved in witchcraft. Water is relatively light in weight, so a very tall tube with a large amount of water had to be used in order to compensate for the heavier weight of atmospheric pressure. Torricelli conducted his first barometric experiments using a tube of water. The mercury barometer is the oldest type of barometer, invented by the Italian physicist Evangelista Torricelli in 1643. Barometers have to be adjusted for changes in altitude in order to make accurate atmospheric pressure readings. As altitude decreases, the density of air increases, as does the number of atmospheres. The number of atmospheres drops as altitude increases because the density of air is lower and exerts less pressure. An atmosphere (atm) is a unit of measurement equal to the average air pressure at sea level at a temperature of 15 degrees Celsius (59 degrees Fahrenheit). A rapid increase in atmospheric pressure pushes that cloudy and rainy weather out, clearing the skies and bringing in cool, dry air.Ī barometer measures atmospheric pressure in units of measurement called atmospheres or bars. Low-pressure systems are associated with cloudy, rainy, or windy weather. Low pressure means that there isn’t enough force, or pressure, to push clouds or storms away. Meteorologists use barometers to predict short-term changes in the weather.Ī rapid drop in atmospheric pressure means that a low-pressure system is arriving. Changes in the atmosphere, including changes in air pressure, affect the weather. Barometers measure this pressure.Ītmospheric pressure is an indicator of weather. That air has a weight and presses against everything it touches as gravity pulls it to Earth. The atmosphere is the layers of air wrapped around Earth. A barometer is a scientific instrument used to measure atmospheric pressure, also called barometric pressure.
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