Air Pressure :: essays research papers

Air stormAir is composed of molecules. Air is matter. It has corporation and takes up space. Air is composed of different gases such as nitrogen, oxygen, coulomb dioxide, water vapor, and other gases. Air molecules are in constant motion. As they move, they come in contact with surfaces. Air molecules push and press on the surfaces they contact. The amount of force per unit area that line of descent molecules exert on a surface is called gentle wind pressure level. (What is Air Pressure 6) Air pressure is caused by all of the billet molecules in the Earths atmosphere pressing quite a little on the Earths surfaces. We can measure air pressure to help us predict weather conditions around the world. Temperature also affects air pressure because air contracts when it cools and expands when it is heated. So if air above a region of Earth cools, it does non extend to as high an altitude as the touch air. In this case, its pressure at higher temperature is lower than in the surro undings til now when the pressure at the surface is the same as in surrounding areas. Then air flows into the cooler region at high altitude, reservation the total weight of air above the region greater than in the surroundings. This is a "high". The cool air descends to the spikeths surface. Near the surface, the falling air spreads out, spiraling clockwise in the northern hemisphere. The opposite happens where air is warm up by the sun or by the Earths surface temperature. The resulting move up air is above a "low." Near the surface, air flows into the "low" to replace the rising air, spiraling counter-clockwise (Atmosphere 26). Highs and lows react to each other causing a change of conditions. Driving up or down a mountain leads to a reduction or increase of air pressure in the outer(prenominal) part of the ear, creating a pressure difference across the eardrum, which separates the outer ear from the middle ear. The difference distorts the eardrum, so that sounds are muffled (What is Air Pressure 9). However, this can be taken care of by swallowing air and arising the Eustachian tube between the middle ear and the nasal cavity, which in bias is joined to the mouth.