Density of regular and irregular objects
Use appropriate apparatus to determine the density of regular/irregular solids and liquids.
Check your understanding with these quick common questions. Use the drop down boxes to see the correct answers.
Density
Density depends on the mass and volume of an object. The closer packed the particles, the more dense it is. You might be asked to measure the density of regular or irregular objects. The formula is Density = mass/ volume. The standard units are kg and m3
This is more of a procedure than an investigation,
Eureka can
Calippers (or ruler)
Measuring cylinder
Mass balance
Accuracy can be improved by: Using callipers for small lengths; reading cylinders at eye level; repeating and averaging.
Validity can be improved by: ensuring objects fully submerged; drying objects before re-weighing.
For regular objects, you might need to use a formula to calculate volume, like the volume of a sphere. This will be given to you. For a cuboid you will need to use length x width x height.
Measure mass on a balance.
For regular solids: measure dimensions and calculate volume.
For irregular solids: use a displacement can/cylinder (or Eureka can) to find volume.
Collect the displaced water in a measuring cylinder.
Calculate density using Density = Mass /Volume.
Remember to use the correct units kg and m3