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Air Pressure

Air Pressure. By Alex P, Manly, and Thomas C. Air Pressure. One of the most significant aspects of weather is air pressure. What is it?. Like all matter, air is a mixture of gases which has volume and mass. This being the case, the molecules and atoms of these gases exert pressure.

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Air Pressure

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  1. Air Pressure By Alex P, Manly, and Thomas C

  2. Air Pressure One of the most significant aspects of weather is air pressure.

  3. What is it? • Like all matter, air is a mixture of gases which has volume and mass. This being the case, the molecules and atoms of these gases exert pressure. • The closer one is to sea level, the greater the pressure. • Atmospheric pressure is the force per unit area exerted against a surface by the mass of air above the surface in the earth’s atmosphere. • This is because the atoms and molecules are more closely packed together and there are more of them than those higher in the atmosphere.

  4. How it Happens • Because the earth is rotating, the air doesn’t blow in a straight line. In the northern hemisphere, the spin of the earth causes the winds to slant to the right. In the southern hemisphere, the spin of the earth causes the wind to slant to the left. This is because of the Coriolis Effect.

  5. What’s Happening Inside Highs and Lows • As the name says, a "high" is a space where the air's pressure is higher than the pressure of the surrounding air. • Low pressure areas have less atmosphere mass above their location, while on the other hand high pressure areas have more atmosphere mass above their location. • A "low' is where it's lower than the surrounding air. • Meteorologists don't have any particular number that divides high from low pressure; it's the similar differences that count. • Cold air masses are heavier than warm air masses and when they collide, they cause storms or rain. The cold air mass has high pressure and the warm air mass has low pressure. That’s what really causes rain and storms.

  6. (MSLP) • Mean sea level pressure, MSLP, is the pressure at sea level (when calculated at a given elevation on land). • This is the pressure regularly given in weather reports on radio, television, and newspapers or on the Internet. When barometers in the home are set to match the local weather reports, they calculate pressure reduced to sea level, not the actual local atmospheric pressure.

  7. Conclusion Highs and lows indicate the amount of air pressure. When they collide, rain may start to fall. If you remember anything from this power point, remember that air pressure is the force of pressure pushing down on an object from the atmosphere.

  8. Bibliography • http://www.wxdude.com/page15.html • http://www.usatoday.com/weather/tg/whighlow/whighlow.htm • http://en.wikipedia.org/wiki/Air_pressure

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