The particle model

• What does the particle model explain about substances?

  It explains why some properties of a substance depend on its state.
• Why can't you compress a substance in its solid or liquid state?

  Because there is no space for the particles to move into.
• What is a characteristic of substances in a solid state?

  They have a fixed shape and cannot flow.
• Why do particles in a solid state vibrate around fixed positions?

  Because they cannot move from place to place.