Density

• • Density = mass (kg) / volume (m^3)
• • Density is mass per unit volume
  • Dense material have tightly packed particles
  • Less dense material have spread particles
• Solids:

  • Strong forces of attraction hold particles together in fixed, regular arrangement
  • Particles don't have much energy
  • Density is highest as particles are close
• Liquids:

  • Weaker forces of attraction between particles
  • Particles are close together, move past esch other, form irregular arrangements
  • More energy in particles than solid - move in random directions at low speeds
  • Less dense than solids
• Gases:

  • No forces of attraction between particles
  • Particles have more energy than liquids and solids - free to move and travel in random directions at high speeds
  • Less dense than liquids - low densities