Purpose
To demonstrate that even though gases cannot
always be seen, they do
take up space.
| Procedure |
| 1. |
Fill
the bucket ½ full with water. |
| 2. |
Wad
the paper towel into a ball and push it
to the bottom of the cup. |
| 3. |
Turn
the cup upside down. The paper wad must
remain against the bottom of the cup. Make
the paper ball a little bigger if it falls. |
| 4. |
Important:
Hold the cup vertically with its mouth pointing
down. Push the cup straight down into the
bucket filled ½ full of water. |
| 5. |
Important:
DO NOT TILT the glass as you lift it out
of the water. |
| 6. |
Remove
the paper and examine it. |
Results
The paper is dry.
Why?
The glass is filled with paper and air. The
air prevents the water
from entering the glass, thus keeping the paper
dry. This demonstrates that air is an example
of matter (material that makes up the physical
things in the universe). On Earth, matter takes
up space and has weight.
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