23. Atmospheric Pressure

[THE NATURE OF] PRESSURE AND WIND J.T. II Olivar, MAEd Faculty of Arts and Letters University of Santo Tomas

Outline of the Lecture 

The Impact of Pressure 

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Wind and Pressure

The Nature of Atmospheric Pressure Standard Atmospheric Pressure Pressure, Density, and Temperature

Wind and Pressure  

Winds are Horizontal Flows of Air Pressure describes the tendency of air to rise or to sink

The impact of pressure and wind on the landscape is significant but indirect

The Nature of Atmospheric Pressure  

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Gas molecules The pressure of the gas is defined as the force the gas exerts on some specified area. Atmospheric pressure is the force exerted by the gas molecules on some area of Earth’s surface or any other body.

[Standard] Atmospheric Pressure 

[At sea level] 14.7 psi  

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1013.2 millibars (mb) 29.92 in. of Mercury (Hg)

Slightly more than 1 kilogram per square centimetre.

Pressure, Density, and Temperature 

How is atmospheric pressure related to the density and temperature of the atmosphere?

Pressure and Density 

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Density is the amount of matter in a unit volume. Gas density changes so easily. The density of gas is proportional to the pressure on it.