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Download Air pressure gases - Hewlett
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The Earth’s Atmosphere Atmospheric Science • Study of structure and dynamics of the Earth's atmosphere • Meteorology – atmosphere & atmospheric phenomena (weather) • Climatology – study of climate (average weather conditions) Atmospheric Pressure – exerts large downward pressure results from presence of air molecules (motion, size, number) • gravity – compresses air near surface (increase density) felt by any surface in contact by air • atmosphere Density • Gravity pulls the atmosphere downward • atmosphere made up of gases which can be compressed • lower atmosphere the greater the density Atmospheric Composition Permanent gases N2: 78% volume O2: 21% volume Variable Gases • Water vapor (H20v) • Carbon Dioxide (CO2) • Ozone (O3)
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