density

• Density


  The mass per unit volume of a substance or object
• The unit of density is kilograms per meter cubed
• The density equation is not given in the exam
• Regular objects


  • Have dimensions that are easy to measure
• Determining density of regular objects

  1. Measure mass using a balance

  2. Measure dimensions using a ruler

  3. Calculate volume from dimensions

  4. Apply density equation
• Irregular objects


  Have dimensions that are not easy to measure
• Determining density of irregular objects

  1. Measure mass using a balance

  2. Use displacement method to measure volume

  3. Apply density equation
• The displacement method involves placing the object in water and measuring the volume of water displaced
• The volume of water displaced is equal to the volume of the object
• This practical on determining density could come up as an exam question
• More practice questions on this practical are available in the revision workbook