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Comparison of Air Inside and Outside a Balloon

Explore the differences between the air inside a balloon and the air outside, including compression and molecule density. Elevator to Space Investigation 2: Where's the Air?

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Comparison of Air Inside and Outside a Balloon

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  1. Day 6 This balloon is filled with air. How does the air inside the balloon compare with the air outside the balloon? The air inside is more compressed than the air outside. There are more air molecules inside than in an equal region of air outside.

  2. Elevator to Space Investigation 2, Part 2a Where's the Air?

  3. Earth From Space • Turn to page 8 in your Resources book. • The lower photo was taken by Apollo 17 astronauts in 1972. They were in space at the time. • The upper photo was taken by space-shuttle astronauts who were orbiting in Earth's atmosphere. It shows only a small portion of Earth.

  4. The Atmosphere What is the atmosphere? It's the layer of air that surrounds Earth. Can you see the atmosphere in the photo taken from space? no Can you see the atmosphere in the photo taken from the shuttle? yes

  5. The Atmosphere Why can't you see the atmosphere from space? It's too thin to be visible from far away. • Scientists describe the atmosphere in terms of layers based on properties at different elevations. • The lowest level, where we live, is called the troposphere. Earth's weather happens in the troposphere.

  6. The Atmosphere • Second is the stratosphere. The ozone layer is in this layer. • Third is the mesosphere. This is the layer where meteors burn up to create shooting stars. • Fourth is the thermosphere, and the farthest layer out is the exosphere. Beyond the exosphere is outer space.

  7. Elevator to Space • Sample the air at the ground level and record the data in the table on worksheet 11.

  8. Particle Model • Examine the particle model on the right side of the screen. • How is it different from the other models we've been working with? • It uses different colors and shapes to show the different kinds of gas molecules that make up the air sample.

  9. Particle Model • What is in the spaces between the different gas molecules? • nothing -- the spaces are empty

  10. Elevator to Space • Continue sampling air at different elevations and record the measurements in your data table.

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