density

• Solids


  • Particles are very close together and arranged in a regular pattern
  • Particles vibrate but do not move from place to place
• Liquids


  • Particles are still close together but not arranged in a regular pattern
  • Particles can move around each other
• Gases


  • Particles are very far apart and not arranged in any pattern
  • Particles are moving very rapidly
• Density


  The mass divided by volume
• Solids and liquids


  Usually have high density because particles are close together and have a lot of mass for their volume
• Gases


  Usually have low density because particles are far apart and have small mass for their volume
• Polystyrene is a solid with low density due to its open structure and air spaces