# GASES

The following table contains information copied from CpSurf- Hewitt's Companion Web Page for this chapter

20.1 THE ATMOSPHERE

The Atmosphere

WW2010

Developed by the Department of Atmospheric Sciences at the University of  Illinois Urbana-Champaign, the Weather World 2010 project integrates current and archived weather data with multimedia instructional resources. The Online Guides provide a collection of  instructional modules in meteorology and remote sensing plus curriculum projects and classroom activities. The Archives contain case studies of memorable weather events.

20.2 ATMOSPHERIC PRESSURE

Pressure

To learn more about  atmospheric pressure, check out this module from the Meteorology Guide. Sections include: Definition of Pressure, Pressure with Height, Isobars, High  Pressure Centers, and Low Pressure Centers.

Controlling Atmospheric Pressure

Interested in performing a low-pressure experiment? This Scientific American article explains how to create your own spherical altitude chamber.

How the  Weather Works

These links from the USA Today Weather site examine various weather phenomena, including jet streams, El Nino, the greenhouse effect, and dust storms of the Sahara.

CNN Weather Maps

The CNN weather maps page provides forecast maps and satellite images for the entire world.

#### 20.3 THE SIMPLE BAROMETER

Balloons

What is a barometer? Is our atmosphere a fluid? Find out the answers to these and other questions in Louis A. Bloomfield's online book How Things Work.

How a Barometer Works

How does a barometer work? Learn all about barometers in this page from the USA Today Weather site.

Make a Barometer

Do you know what the air pressure is today? Find out by using your own barometer. Make a barometer from a coffee can by following these instructions from the Miami Museum of Science.

### 20.4 THE ANEROID BAROMETER

How an Aneroid Barometer Works

What is an aneroid barometer? How does it work? Find out in this page from USA Today.

20.5 BOYLE'S LAW

Pressure/Volume Calculator

This Javascript calculator from Scuba Physics uses Boyle's law to determine the pressure and volume of a gas for a given underwater depth and temperature.

Gas Laws

This is a nice introduction to the gas laws, including Boyle's law. This lesson is part of ChemWeb, an online introductory chemistry course.

20.6 BUOYANCY OF AIR

Ever Eastward

Soaring around the world in a balloon is a romantic notion. Yet no one has done it. In this Scientific American feature article, learn about the new technologies that may soon allow this feat to be accomplished.

Hot Air Balloon

Find out how a hot air balloon works in this page from  NASA's Beginner's Guide to Aeronautics.

20.7 BERNOULLI'S PRINCIPLE

Balls, Birdies, and Frisbees

How does the trajectory of a ball change when you give it a spin? Why are there dimples on a golf ball? Learn the answers to these and other questions in Louis A. Bloomfield's online book How Things Work.

Bernoulli Levitator

In this Exploratorium Snack activity, you will use a hair dryer and an index card to demonstrate Bernoulli's principle.

Bernoulli's Principle

Check out this page from the Aeronautics Learning Laboratory for a lesson on Bernoulli's principle, including an animation of a Venturi tube.

20.8 APPLICATIONS OF BERNOULLI'S PRINCIPLE

Airplanes

How does wing shape affect an airplane's flight? How does a paper airplane fly? Find out the answers to these and other questions from Louis A. Bloomfield's online book How Things Work.

Ping Pong Ball Curves