Vocabulary - Hot Air, Cold Air
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STUDENT RESOURCE 2.1
Vocabulary
INFORMATION SHEET
contract to get smaller in size
When something is cooled, its
particles move closer together. The
amount of space between particles
gets smaller.
expand to get larger in size
When something is heated, its
particles spread out. The amount of
space between particles gets bigger.
heat energy the energy of moving
particles
The particles that make up solids,
liquids, and gases are always moving.
When heat energy is added, particles
move even faster. When heat energy is
taken away, particles move slower.
AIR • SECTION 2 HOT AIR, COLD AIR
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