Density

• Density describes how closely packed the particles are in a solid, liquid or gas.
• Water and ice

  • the particles are tightly packed in both solid and liquid states
  • the same number of particles in a gas spread further apart than in the liquid or solid states
  • the same mass takes up a bigger volume
  • this means the gas is less dense
• Iron = 7.8g/cm³

  Ice = 0.98g/cm³

  Water = 1g/cm³

  Air = 0.00129g/cm³
• Calculating density 


  density = mass ÷ volume

  p = m÷V

  • p - kg/m³
  • m - kg
  • V - m³
• Conversion 


  1g/cm³ = 1,000 kg/m³
• Aluminium = 2.7g/cm³ or 2,700kg/m³

  Lead = 11.6g/cm³ or 11,600kg/m³