Page 23 - York Global Science 6 - Physical Science

Physical Science

Let’s Learn

The particles in solids, liquids and gases are arranged differently. Solids

have very closely packed particles, but gases have particles that are more
spread out.

solid liquid gas

high low
density density

Density is a measure of how closely packed the particles are inside a
material.

• Materials with a high density have more particles that are packed closer
together. Solids often have a high density.

• Materials with a low density have particles that are less closely packed.
Gases usually have a low density. There are bigger spaces between the
particles.

When a material changes state, the total mass of the particles stays the
same but the density changes.

Think!

How does the density of the water particles change when water boils?

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