What do storm reports reveal?
The pressure in the atmosphere is an important factor in determining what the weather will be like. If the barometric pressure is high in an area, this will cause air to move to a region of lower pressure.
The greater the difference in pressure between the two areas, the stronger the winds will develop.
Under certain conditions, the winds can produce a tornado (a violent rotating column of air that reaches from a thunderstorm down to the ground).What do storm reports reveal?
Atmospheric Pressure
Atmospheric pressure is the pressure exerted by gas particles in Earth's atmosphere as those particles collide with objects. A barometer is an instrument used to measure atmospheric pressure.
A traditional mercury barometer consists of an evacuated tube immersed in a container of mercury.
Air molecules push down on the surface of the mercury. Because the inside of the tube is a vacuum, the mercury rises inside the tube. The height to which the mercury rises is dependent on the external air pressure.
A more convenient barometer, called an aneroid barometer, measures pressure by the expansion and contraction of a small spring within an evacuated metal capsule.
Altitude and Atmospheric Pressure
With the increase of altitude, the atmospheric pressure decreases. Above 5.5 km (18,000 feet), the air pressure becomes half of the sea level and at the height of Mount Everest (29,000 feet), the atmospheric pressure is only one third of the pressure at sea level. In the lower atmosphere, the pressure decreases rapidly with height.
The decrease in pressure with altitude, however, is not constant.
Since the factors controlling air density – temperature, amount of water vapor, and gravity are variable, there is no simple relationship between altitude and pressure. Check the graphic representation of relationship of altitude and atmospheric pressure.
Atmospheric Pressure Formula
P = F/A = (m*g)/A, where A is surface area. Atmospheric pressure is thus proportional to the weight per unit area of the atmospheric mass above that location, Pressure (p), mass (m), and acceleration due to gravity (g).
P=F/A is the formulae of Pressure.
The atmospheric Pressure is the seconf one where the force is mass of the atmosphere and gravity multiplied. That's because gravity is a force and the gas is the mass.