Density

• What is one of the learning objectives of this topic?

  To know what is meant by density
• How can density be measured?

  By measuring the mass and volume of a solid
• What is the formula to calculate density?

  Density = mass of object / volume
• What are the units for density?

  kg/m³ or g/cm³
• Why is a concrete block heavier than a wooden block of the same size?

  Because the density of concrete is much greater than that of wood
• What does density represent?

  How much mass a substance has in a certain amount of space
• If you have a mass of 20 kg and a volume of 0.025 m³, what is the density?

  800 kg/m³
• How does the method of measuring density differ between regular and irregular-shaped objects?

  Regular objects use geometric formulas for volume, while irregular objects use water displacement
• What is the first step in measuring the density of a regular-shaped object?

  Measure and record the length, width, and height of the object
• What is the equation to calculate the volume of a regular-shaped object?

  Volume = length x width x height
• If a stone has a mass of 65 g and displaces 25 ml of water, how would you calculate its density?

  By dividing the mass by the volume displaced
• What does 1 ml equal in terms of volume measurement?

  1 cm³
• What is the mass of the empty beaker mentioned in the study material?

  50.0 g
• How would you calculate the mass of the vegetable oil if the total mass of the beaker and oil is 63.5 g?

  By subtracting the mass of the empty beaker from the total mass
• How can you determine the density of the vegetable oil after calculating its mass?

  By dividing the mass of the oil by its volume
• What is the density of concrete as listed in the study material?

  2400 kg/m³
• What is the density of water?

  1000 kg/m³
• What is the density of air?

  0.0013 kg/m³
• In the worked example, what is the density of the wooden post calculated to be?

  800 kg/m³
• What are the steps to measure the density of an irregular-shaped object?

  Measure mass, use a displacement can, and calculate volume
• How do you calculate the density of the wax given its mass and volume?

  By dividing the mass of the wax by its volume