วันเสาร์ที่ 23 กรกฎาคม พ.ศ. 2554

What is air pressure?

What is air pressure?

What is air pressure?

Posted: 23 Jul 2011 06:40 AM PDT

Presser Feet

Even if you can not see the air pressure is always there and has a real weight. It 'consists primarily of molecules of oxygen and nitrogen. Air consists of 78 percent nitrogen and 21 percent oxygen and less than 1 percent other gases in t has become the bottom of the atmosphere in which we live. At higher levels of the atmosphere, the gas composition is slightly different from the basis of a number of factors.

Air molecules are constantly moving. It accelerates with increasing temperature and slow down when cooled. The speed with which it is moving very quickly. Closer to the Earth's surface air molecules of the gas is moving at an incredible speed of about 1090 mph. When air is heated faster and move more slowly when the air is cooled.

The effects of the molecules in motion is what actually causes the air pressure. Pressure depends on how many molecules are in a given space and how fast they move. Heating the air increases its Pressure> and cooling the air reduces the pressure. Put air in less space and therefore increases the pressure to expand the air in a wider area reduces the pressure.

Gravity affects the air pressure. The pressure is greater at lower levels in stature, because the weight of air pushing on it. Pressure at high altitude is lower because less weight pushing down.

At sea level the average air temperaturePressure> is 14.7 pounds per square inch. At 1,000 meters above sea level, the pressure to 14.1 pounds per square inch has fallen. All the way up to 18,000 feet altitude, the pressure is about 7.3 meters per square inch. Showing how the air pressure decreases with altitude by pressing less weight. Higher elevations often have different cooking times to prepare food because of this.

References were takenThe Weather Book by Jack Williams.

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