Page 167 - Science Course 1 (Book 1)

Mo5-L2b: How Do Particles Move in Solids, Liquids, and Gases?

Key Concept The gas state of a substance that is normally a solid
or a liquid at room temperature is called vapor.
How Do Particles Move in Solids,
Liquids, and Gases?
Describe the movement of particles in a liquid and
the forces between them.

Key Concept
How Do Particles Move in Solids,
Liquids, and Gases?
How do particles move and interact in a gas?

Gases

A gas is matter that has no definite volume and no
definite shape.

Compared to the particles in the solid and the liquid
states, the particles in gases are far apart.

- No definite shape
or volume
- Particles far apart
and move freely
- Slight or weak
attractive forces
between particles.
SUMMARY
How Do Particles Move in Solids, Liquids, and Gases?

The particle motion in a liquid is faster than
the particle motion in a solid.
In a gas, the forces of attraction between the
particles are not strong enough to keep the particles
close together.

Because the particles in gas are moving quickly, the
distance between particles increases, and the
attractive forces between particles decreases.

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