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Day 4

Day 4. If you could see the particles that make up air, what would you see?. The particles are always moving very fast. They bounce randomly and spread out in all directions, so there is a lot of space between particles. Air Takes up Space. Investigation 2, Part 1a Where's the Air?.

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Day 4

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  1. Day 4 If you could see the particles that make up air, what would you see? The particles are always moving very fast. They bounce randomly and spread out in all directions, so there is a lot of space between particles.

  2. Air Takes up Space Investigation 2, Part 1a Where's the Air?

  3. Focus on Air Where does weather happen? In the air that surrounds Earth. • Air plays a very important role in the weather. • In the next few days we are going to look more closely at air to learn some of its properties.

  4. Syringe Activity • Fill the syringe with water. • Seal the end and push on the plunger. • Repeat the activity, but this time fill the syringe with air. • What can you conclude from this activity?

  5. Air Investigations • Use your syringe to investigate air and find out what it can do. • Turn to Air Investigations (page 3 in the lab notebook). • In part 1, record three observations and three questions about air.

  6. Discuss Observations What happens when you clamp the tube closed and push on the plunger? The air is pushed into a smaller space. Is there more air, less air, or the same amount of air in the syringe when the air is pushed into a smaller space? same amount

  7. Discuss Observations What happens when you let go of the plunger after pushing it in? The air pushes the plunger back out. What do you think happens to the air when it is pushed into a smaller space? (answers will vary) What do you think happens to push the plunger back out when you let it go? (answers will vary)

  8. Air Molecules • Draw a model to show what you think happens to the air molecules inside the syringe when you seal the end and push on the plunger. • Draw another model to show what happens to the molecules when you release the plunger.

  9. Gas in a Syringe • View the animation called Gas in a Syringe.

  10. Air is Compressible • When you push on the plunger and force the air into a smaller space, we say the air is compressed. • Air is compressible because it's a gas, and gases contain a lot of empty space. • Compressed air pushes back with a force equal to the force compressing it.

  11. Bumping Molecules How does compressed air push back? When molecules are pushed into a smaller space, they bump into the inside of the syringe more often. All of this bumping creates pressure.

  12. Air Pressure • Pressure is a force or set of forces that is spread out over a surface. • Each time an air molecule bumps the plunger, it exerts a force called a push. • The combination of all those pushes on the inside of the syringe creates the inside air pressure. • Similarly, the molecules bumping the outer surface create the outside air pressure.

  13. Air Pressure • When the outside air pressure is greater than the inside air pressure, the plunger will move in. • When the inside air pressure is greater, the plunger will move out. • When the two pressures are equal, the plunger will stay where it is.

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