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Barometric Pressure Temperature Essay

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Barometric Pressure Variation
INTRODUCTION
Barometric Pressure Variation is the atmospheric pressure that is exerted at any given point as indicated by barometer. Atmospheric pressure is the pressure that is exerted on a surface by the weight of air above that surface in the atmosphere of Earth. The physics definition of pressure is force per unit area. The units are pounds per square inch (psi). Pressure = Force / Area
Units = pounds per square inch (abbreviated psi)
Unit Used to Measure Atmospheric Pressure
The following are the unit used to measure atmospheric pressure
Pascal (Pa)
1 Pa = 1 N/m²
Standard Atmospheric Pressure (atm)
1 atm = Atmospheric Pressure at sea level ( = 101,325 Pa) mmHg (also known as torr)
1 mmHg = 1/760 atm (roughly equal to the liquid pressure exerted by a millimetre of mercury).

Barometer …show more content…

There are two main types of barometers – the most widely available and reliable Mercury Barometers, or the newer digital friendly Aneroid Barometer. Pressure tendency can forecast short term changes in the weather. Numerous measurements of air pressure are used within surface weather analysis to help find surface troughs, high pressure systems and frontal boundaries.
Mercury Barometers
The classic mercury barometer is typically a glass tube about 3 feet high with one end open and the other end sealed. It is a long narrow glass tube filled with mercury supported in a container of mercury. The tube is filled with mercury. This glass tube sits upside down in a container, called the reservoir, which also contains mercury. The mercury level in the glass tube falls, creating a vacuum at the top. The first barometer of this type was devised by Evangelista Torricelli in 1643. It is a long narrow glass tube filled with mercury supported in a container of

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