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Now that we've seen some ways in which air can move, and some ways that we can detect the directions in which it moves, let's see what we can do to make air move hard enough to
cause something else to happen.

Cut a hole in one end of a shoe box or a similar cardboard box. Squeeze the sides of the box and feel the air coming from the hole. Squeeze the box and try to blow bits of paper or feathers with it.

Float a cork, a small piece of wood, or a matchbox, in a pan of water. Fan the object with a sheet of cardboard or a fan to move it across the water.

Fill a balloon, then let it go. You will see that when the gas (air) moves out of its neck, the balloon is forced in the opposite direction.

Smooth a paper bag, and put it near the edge of a table with the open end over the side. Place a small or medium-sized book on the bag, and inflate the bag. You will see that the air has enough force to lift the book.

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