Density of materials

• Equation that links density, mass and volume:

  • density = mass/volume

  density in kg/metres cubed, mass in kg, volume in metres cubed
• The particle model can be used to explain

  • the different states of matter
  • differences in density
• differences in density between the states of matter

  • Solid is the most dense
  • liquid is in the middle
  • gas is the least dense
• Particle arrangement for solid

  • Tightly packed in a regular arrangement
  • particles can only vibrate on the spot

  
• Particle arrangement for liquid

  • Close together, but with an irregular arrangement
  • they can flow over each other

  
• Particle arrangement of a gas

  • Separated, with no regular arrangement
  • particles can move freely