ATMS 120 Lecture Notes - Lecture 2: Pressure Gradient, Atmospheric Pressure, The Empty Bottle
6 Feb 2021
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Document Summary
The force exerted inside is the same as the air pressure and density outside the spheres before the vacuum. After vacuum, there were more pushing in than there is pushing out. Differences in pressure makes the wind blow. Wind always moves from high pressure to low pressure. Pressure gradient: pressure change that causes winds. Atmospheric pressure: force per unit area applied to the air. Can be thought of as the weight of the air above an area. It is the collision force of the air against a surface. Benchmark air pressure values: strong arctic high pressure. Strong arctic high/canadian high/siberian high: 1040 mb+ Conditions are extremely cold, very light winds, dense air, clear skies, descending air aloft. If pressure is increasing, skies are clear. Conditions are strongly contrasting temperatures, clouds, precipitation, and very windy. Low pressure and rising air causing precipitation. Conditions: clouds, lots of rainfall, winds over 74 mph. Conditions: clouds, torrential rains, winds over 200 mph.
