Sumit on you. This is the same way air

Sumit LahaMrs.MarshallEarth Science Per.6 Barometer 12/15/17 Hey Siri, What’s a Barometer This morning I asked Siri, “What’s the weather” and I wondered where she got her information.  When I looked deeper I understood that she used a thermometer, a barometer, an anemometer, and other weather instruments.  Later I was flooded with questions about the barometer.  What is air pressure?  How does a Barometer work?  What are the different barometers?  What were its first uses?  But overall, barometers are a very helpful and interesting utility. First, what is air pressure?  Imagine swimming or scuba diving.  When you start to go deeper into the water you can feel the pressure of the water on your body.  This is because there is more water above you and so it puts more pressure on you.  This is the same way air pressure works.  When air cools it becomes more dense and heavy so it falls creating high pressure.  When it is hot and sunny outside air becomes less dense, thus rising reducing the amount of pressure.  but no matter what there is always pressure on top of us (Explain That Stuff Dec 19). But, how does all of this measure pressure?  With barometers of course.  There are various types of barometers such as the liquid barometer, aneroid barometer and the mercury barometer.  These different barometers can be used for different purposes.  For example, they can be used to measure altitude or height, or the depth of a mine.  But, the most common use was to measure air pressure and predict the weather.  The barometer that is most commonly used by meteorologists is the aneroid barometer invented in 1844, by French scientist Lucien Vidi.  Inside of the device is a small capsule in which the air inside has been removed.  When the air pressure rises, the capsule is compressed and pushed inward.  This capsule is hooked up to levers which move a needle or pointer as the air pressure compresses the capsule.  A dial behind the needle informs you of the air pressure and weather forecast (National Geographic Dec 7). Bhello person Although the aneroid barometer is more common, the mercury barometer is the first.  It was made by Italian physicist Evangelista Torricelli in the year 1643.  His first barometer was quite strange as it was 10 meters high(35 ft) and used water.  Later he compacted his barometer by using mercury instead.  This upgrade uses a glass tube that sits on top of a dish or mercury.  The mercury sits in a small plate enclosing the tube.  As time passes the mercury in the tube will relocate itself to emulate with the atmospheric pressure above the dish.  When pressure rises, the mercury travels up the cylinder.  The cylinder is marked with measurements that track the number of atmospheres.  The air pressure can then be observed and used to predict the weather (National Geographic Dec 7).These “old timers” used to be common back in the 1600s but now it’s a rarity to find one in the present day.  The devices are now replaced by newer barometers that show digital data and more precise readings.  Scientists have been working on barometers for centuries now making them better each time and reducing their size.  Now these devices are so small they fit in phones and other electronics.  These barometers play a huge role in GPS systems because they help the computer find the elevation of the land making the system run more smoothly. Some are old and some, are new but they all help us in their unique ways.  Several can be used to measure altitude while others can forecast the weather.  But, in the long run, barometers will continue to evolve and help meteorologist predict the weather.Work CitedExplain that Stuff.com.  N.p., n.d.  Web.  10 Dec.  2017.www.explainthatstuff.com/barometers.html.Sciencing.com.  N.p., n.d.  Web.  10 Dec.  2017..ThoughtCo.com N.p., n.d.  Web.  10 Dec.  2017.www.thoughtco.com/how-barometers-measure-air-pressure-3444416.