density of materials

• higher number of particles = more mass
• you can have the same volume but different mass
• density = mass (kg) / volume (m3)
• to get the density of a solid block: mass (kg)

  • find the volume (length x width x mass)
  • weigh the block (find the mass)
  • mass/volume = density
• solids and liquids are very hard to compress, gasses aren't
• percentage differences = (calculated value - true value / true value) x 100
• to find the density of an irregular shaped object:

  • use a balance to measure its mass
  • fill a eureka can (a can with a sprout in it's side) with water
  • place a measuring cylinder under the sprout
  • place your object into the water
  • measure the volume of water that has collected in the measuring cylinder
  • this is equal to the volume of the object
  • use the formula above to find the object's density
• how do you find the volume?

  length x width x mass