Ch 5: Atmospheric Pressure and Wind

Watch online video lessons to learn about the ideal gas law, weather variables and more. Each lesson is accompanied by a short multiple-choice quiz you can use to check your understanding of these atmospheric pressure and wind topics.

Atmospheric Pressure and Wind - Chapter Summary and Learning Objectives

In this chapter, you'll learn all about atmospheric pressure: what it is, how it's measured, which variables affect it and how to calculate it. You'll also explore the three levels of atmospheric circulation and find out how driving and surface winds are created. By the end of this chapter, you should be able to:

• Explain horizontal and vertical changes in air pressure.
• Convert between atmospheres and mm Hg.
• Use a barometer, anemometer and wind vane.
• Differentiate between super geostrophic and subgeostrophic wind flow.

VideoObjective
Weather Variables: Air Pressure, Temperature & DensityDescribe high and low pressure centers.
The General Circulation of the AtmosphereDescribe the general circulation of the atmosphere.
Pressure: Definition, Units and ConversionsDefine pressure and learn to convert among units of pressure.
Dalton's Law of Partial Pressures: Calculating Partial & Total PressuresUse Dalton's law of partial pressure to calculate partial and total pressures. Use it to explain how to find the partial pressure of a gas collected over water.
Defining & Describing Atmospheric PressureDefine and describe atmospheric pressure.
How Altitude Affects Air PressureDiscuss how air pressure varies with altitude.
The Ideal Gas Law and the Gas ConstantUse the kinetic molecular theory to explain relationships among gas, volume, temperature and pressure. Use the ideal gas law to calculate the pressure, volume, temperature or amount of gas when the other three are known.
Using the Ideal Gas Law: Calculate Pressure, Volume, Temperature or Quantity of a GasRearrange the ideal gas law to calculate the temperature, pressure, volume or quantity of gas given the other three variables.
How Pressure is Measured & How it Affects the AtmosphereDescribe how pressure is measured, and determine how the atmosphere is affected by pressure. Introduce the concept of barometric pressure and pressure as a force.
Identifying & Describing the Levels of Atmospheric CirculationIdentify and describe the three levels of atmospheric circulation: primary, secondary and tertiary.
Driving Wind: Horizontal & Vertical Pressure GradientsExplain the concepts of horizontal and vertical pressure gradients and hydrostatic equilibrium. Describe how pressure gradients drive wind.
Factors that Affect Wind: Pressure Gradient Forces, Coriolis Effect & FrictionDescribe factors that affect wind pressure, including pressure gradient forces, Coriolis effect and friction with the surface of Earth.
The Flows of Geostrophic WindDiscuss geostrophic wind. Learn about geostrophic flow, gradient flow, and super geostrophic and subgeostrophic flow.
Understanding How Surface Winds are CreatedDiscuss surface winds and factors that create them.
Weather Patterns Associated with Cyclones & AnticyclonesDescribe how cyclones and anticyclones develop. Discuss weather patterns associated with cyclones and anticyclones. Discuss ridges and troughs.
Measuring Wind Using Anemometers & Wind VanesExplain how to measure wind via anemometers and wind vanes. Discuss units of measurement and conversion, weather map symbols and observations.

15 Lessons in Chapter 5: Atmospheric Pressure and Wind
Test your knowledge with a 30-question chapter practice test
Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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