Chapter08a - Air Pressure and Winds I Review: precipitation...

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Air Pressure and Winds I
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Review: precipitation types
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Sample weather map (Fig. 13.11)
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Fog Sleet Snow Drizzle Freezing rain Fig. 11.18
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Atmospheric pressure P Atmospheric pressure and density decrease with altitude exponentially!!! area air the of weight area force P = = Units: 1 bar=1000 mbar 1 Standard atmosphere: 1013 mbar
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Ideal Gas Law A relationship between the pressure, the temperature, and the density of an ideal gas. Ideal gas: a simplified physical model for a gas. It neglects: the volume of the individual molecules the interaction between the molecules The ideal gas model is a very good approximation for the air at room temperature.
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The pressure P of an ideal gas is proportional to its temperature T and density ρ . C is a constant of proportionality – air gas constant . Examples: T increases, ρ constant -> P increases (tea kettle) ρ increases, T constant -> P increases (blow a balloon) T decreases, ρ decreases -> P decreases (climb a mountain)
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Chapter08a - Air Pressure and Winds I Review: precipitation...

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