Density (chp.30)

• Density


  Is the mass per unit volume of a substance, 1cm³ of a substance
• Density formula 


  $D=$$mass/volume$
• Unit


  G/cm³ or gcm-³
• Density


  Density is constant at a given temperature. Therefore if we find a density we can identify a substance
• Density


  Density is a characteristic property of a substance
• Floatation

  • An item will float if its density is lower than the density of the liquid
  • An item will sink if its density is greater than the density of the liquid
• Water 


  Most dense at 4°C therefore ice flows on water