01:460:224 Study Guide - Final Guide: Neutral Buoyancy, Coriolis Force, Cool Air
30 Oct 2014
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Document Summary
Wind- horizontal air movement arising from differences in air pressure. Air pressure is related to density: high pressure- more compressed and denser (cold air, low pressure- less compressed and less dense (warm air) Pressure gradient: movement is the result of nature"s attempt to eliminate pressure differences. The coriolis effect: a consequence of the rotation of the earth. Shifts air movements to the right in the northern hemisphere and left in the southern hemisphere. Friction: ground level winds are slowed by friction with the earth"s surface. Warm air in a balloon is less dense than surrounding air, it becomes positively buoyant and rises. Continues to rise until density of the air inside and outside the balloon are the same (neutral buoyancy) If air inside cools and becomes more dense (negative buoyancy), the balloon sinks. Differences in atmospheric pressure causes air to move horizontally from regions of high density cool air to low density warm air until two pressures equalize.
