Vocabulary - Expanding And Contracting
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STUDENT RESOURCE 4.1
Vocabulary
INFORMATION SHEET
contract to become smaller; to
pressure the amount of force
shrink or take up less space
pressing on something
When something contracts,
Air is made of particles that
it becomes smaller because the
have mass. As air particles strike
particles that it is made of come
objects, they exert pressure. The
closer together. When a gas cools,
faster the particles move, the more
it contracts.
pressure they exert. Also, the more
particles there are in a certain
expand to become larger; to spread
area, the greater the pressure will
out or take up more space
be in that area.
When something expands,
it becomes larger because the
particles that it is made of spread
out more. When a gas is heated, it
expands.
ENERGY AND MATTER • SECTION 4 EXPANDING AND CONTRACTING
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