Squeezing them
Close the tip of a syringe with your thumb. Push the plunger, the part that slides in. It moves easily when the syringe holds air. With water it hardly moves.
Step 1 of 4
- Gas: particles sit far apart.
- Push. The gas squeezes into much less space.
- Liquid: particles already sit close.
- Push. The liquid hardly squeezes.
New word
- Compress — squeeze into less space.
The rule
Push a gas and its particles move closer. A gas has a lot of empty space between its particles. A liquid has very little, so water hardly squeezes.
Let go of the plunger. The squeezed gas pushes the plunger back. Its particles spread out again.
Choose air or water. Then push.
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