P1 density

• What should you be able to describe by the end of the video?

  How to determine the densities of solids
• Why is it important to learn the details of density determination?

  It could come up as an exam question
• What does the density of a material tell us?

  The mass for a given volume
• How is density calculated?

  Density equals mass divided by volume
• What is the unit of density?

  Kilograms per cubic meter
• Is the density equation provided in the exam?

  No, it is not provided
• How are objects categorized when determining density?

  Into regular and irregular objects
• How do you measure the dimensions of a regular object?

  Using a ruler to measure each side
• How do you determine the mass of a regular object?

  Using a balance
• If a cube has a mass of 0.5 kg, what is its mass in grams?

  500 grams
• What is the length of each side of the cube in meters?

  0.12 m
• How do you calculate the volume of a cube?

  Volume equals length cubed
• What is the volume of a cube with a side length of $0.12 \text{ m}$?


  $0.001728 \text{ m}^3$
• What is the density of the cube calculated from its mass and volume?

  $28935 \text{ kg/m}^3$
• What method is used to determine the volume of an irregular object?

  The displacement method
• How do you start measuring the volume of an irregular object?

  Find the mass using a balance
• What is a Eureka can used for?

  To measure displaced water volume
• What happens when you place an object in a Eureka can?

  Water is displaced and flows out
• How do you measure the volume of water displaced?

  Using a measuring cylinder
• What does the volume of displaced water equal?

  The volume of the object
• What can you calculate once you have the mass and volume of an object?

  The density of the object
• What are the steps to determine the density of a regular object?

  1. Measure the mass using a balance.
  2. Measure the length of each side with a ruler.
  3. Calculate the volume using length cubed.
  4. Use the formula: Density = Mass / Volume.
• What are the steps to determine the density of an irregular object?

  1. Measure the mass using a balance.
  2. Fill a Eureka can with water.
  3. Place the object in the water to displace it.
  4. Measure the volume of displaced water.
  5. Use the formula: Density = Mass / Volume.