Density

• Density


  Measure of how much mass is packed into a given volume of space
• Density


  • Measure of the 'compactness' of a substance
  • Relates the mass of a substance to how much space it takes up (mass per unit volume)
• Units of density


  kg/m³ (mass in kg, volume in m³)
• Calculating density


  Density (kg/m³) = Mass (kg) / Volume (m³)
• Density can also be given in g/cm³ (1000 kg/m³)
• Factors affecting density


  • What the object is made of
  • How tightly the particles are packed together
• Compressing a material


  Decreases its volume, increases its density (without changing its mass)
• Solids are generally denser than liquids, and gases are usually less dense than liquids
• Measuring the density of a solid object

  1. Measure mass

  2. Find volume (using formula or displacement method)

  3. Plug into density formula
• Measuring the density of a liquid

  1. Measure mass of known volume

  2. Repeat for different volumes

  3. Calculate density for each, then take average
• 1 ml = 1 cm³