Sixth grade
J.2 Particle motion and changes of state
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Questi
answe
You have learned about how particles in solids, liquids, and gases behave as thermal energy
increases. Click the blue words to describe how particles in a substance behave as thermal
energy decreases.
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Tim
elaps
When a gas is cooled, the particles begin to move more slowly. When the
temperature drops below the melting point, the substance's particles have
condensed and formed a liquid. If the liquid is cooled down even more,
the amount of thermal energy in the particles will increase, and the liquid's
temperature will continue to decrease. Eventually, the substance will freeze
and form a solid. If the temperature continues to increase, the particles in
the solid will vibrate in place more slowly.
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