gcse ohy topic 5

• Density

  A measure of how much mass a substance has per unit of its volume
• Finding density

  Divide mass by volume
• Density formula

  Density = Mass / Volume
• Density is normally measured in kilos per meter cubed in physics
• Density in other units

  Grams per centimeter cubed (1 g/cm^3 = 1000 kg/m^3)
• Calculating volume of 420 kilos of aluminium

  Volume = Mass / Density (420 kg / 2710 kg/m^3 = 0.155 m^3)
• Calculating density of a solid experimentally

  1. Find mass

  2. Find volume (regular shape: measure dimensions, irregular shape: use Eureka can)
• Calculating density of a liquid experimentally

  1. Place empty measuring cylinder on balance, zero balance

  2. Pour in liquid (e.g. 10 ml), record mass

  3. Density = Mass / Volume
• Larger volume measurements give more accurate density results
• Taking multiple measurements helps identify anomalies and calculate a mean