Density

• What is the purpose of Core Practical 6?

  Investigate the densities of solids and liquids
• What equipment is needed for the density investigation?

  • Balance
  • Ruler
  • Regular solid (e.g. cube)
  • Irregular solid (e.g. stone)
  • Measuring cylinder
• Why should the balance be zeroed before use?

  To ensure accurate mass measurements
• How do you convert mass from grams to kilograms?

  Divide by 1000
• What should be done before measuring the mass of the liquid?

  Zero the empty measuring cylinder on the balance
• What is the significance of recording the volume of liquid used?

  It is necessary for density calculations
• How do you calculate the volume of a cube?

  Multiply height, width, and depth
• What measurements are needed for calculating the volume of a cylinder?

  Radius and height
• Why must all measurements be in metres?

  To ensure consistency in calculations
• What should you do when placing an irregular solid in water?

  Measure the new water volume
• What does the change in water volume represent?

  The volume of the solid submerged
• How do you convert millilitres to cubic metres?

  Divide by 1,000,000
• What is the formula for calculating density?

  Density = mass / volume
• What units must mass and volume be in for density calculations?

  Mass in kg and volume in m$^3$
• What tips should be followed when measuring liquid in a cylinder?

  • Read from the meniscus
  • Ensure the cylinder is level
  • Take readings at eye-level
• What should be avoided when pouring water into the measuring cylinder?

  Water getting onto the electronic balance
• Why is it important to avoid water on the electronic balance?

  It can damage the balance or cause fire