density

• What does the density of a material tell us?

  The mass per given volume
• How do you calculate density?

  Density equals mass in kilograms divided by volume in cubic meters
• What is the unit of density?

  Kilograms per cubic meter
• What are the two broad categories of objects based on their dimensions?

  Regular objects and irregular objects
• How can you measure the dimensions of a regular object?

  By using a ruler to measure the length of each side
• What is an example of a regular object mentioned in the video?

  A cube
• How do you determine the mass of a regular object?

  By using a balance
• If a cube has a mass of 0.5 kg and a side length of 120 mm, what is the volume?

  $0.001728 \text{ m}^3$
• What is the density of the cube if its mass is 0.5 kg and volume is $0.001728 \text{ m}^3$?


  $289.35 \text{ kg/m}^3$
• 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?

  By finding the mass of the object using a balance
• What is a Eureka can used for?

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

  Water is displaced and flows out through the spout
• How do you find the volume of the object using the displacement method?

  By measuring the volume of water displaced using a measuring cylinder
• What can you calculate once you know both 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 the formula: volume = length³.
  4. Use the density 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 water displaced using a measuring cylinder.
  5. Use the density formula: density = mass / volume.
• What is the significance of the density practical in exams?

  • It is a required practical.
  • It could appear as an exam question.
  • Understanding it is essential for science assessments.