GEOG 2050 Chapter : CH6AirPressure
Document Summary
Developed by evangelista torricelli (1643) mercury barometer (30-inch tube filled w/ mercury) Aneroid barometer uses a metal box (aneroid cell), cell is sealed, cell expands/contracts relative to changes in pressure: air always tries to move from hi pressure to lo pressure (pressure gradient force) Result of the varying rotational velocity of the earth @ diff. latitudes. 1675kmph (1041 mph) runs faster, 1450 kmph (900mph) Grey dotted line is intended path of a moving object; curved arrow is path it takes (b/c deflected by coriolis force: pgf & coriolis force. In the northern hemisphere: as air tires to move from hi to lo pressure, it is deflected to the right of its projected trajectory b/c of the coriolis force. Drags on the wind as it moves across a surface. Aleutian lo, icelandic lo, azores hi, north pacific hi: global circulation (look @ notes) @ around 0 30 degrees trade winds.
