February 26, 2008

ES: YOU WILL HAVE A DO NOW TOMORROW! STUDY
Air (Barometric)Pressure
The force exerted by the column of air overhead
Air pressure is influenced by:
1.Air temperature
2.Elevation above sea level
3.How much moisture is in the air
1. As air temperature increases, air density decreases, so air pressure also decreases. Hot air has a lower air pressure.
As air temperature decreases, air density increases, so air pressure also increases. Cold air has a higher air pressure.
Wind – the horizontal (parallel) movement of air.

Facts about wind:
1.Winds are caused by differences in air pressure between two locations. This difference in air pressure is caused by the differences in temperature between two locations. So, in other words, winds are caused by the unequal heating of the Earth. The larger the difference in pressure, the stronger the wind.
1.Wind direction is also influenced by the Coriolis Effect (Rotation). Winds curve to their right in the Northern Hemisphere, and to their left in the Southern Hemisphere.

2. Winds blow from areas of High Pressure to Low Pressure.
3.Winds blow from areas of Divergence to Convergence.
4.Winds are named after the direction that they are blowing from, not where they are blowing to.
5.Surface ocean currents (not tides) are caused by wind direction.

Math10xr: p. 353 # 17-35, p. 355 # 47-49