Density and pressure

• What are the units used for density?

  kilogram (kg), kg/m³, metre (m)
• What is the formula for density?


  Density = mass / volume
• How can density be investigated practically?

  
  

  
  

  Place the object on a digital balance and note down its mass

  1. Use either the ruler, Vernier callipers or micrometer to measure the object’s dimensions (width, height, length, radius) – the apparatus will depend on the size of the object
  2. Repeat these measurements and take an average of these readings before calculating the density
• What is the formula for pressure?

  Pressure = force / area
• How does pressure act in a gas or liquid at rest?

  It acts equally in all directions
• What is the formula for pressure difference?

  Pressure difference = height × density × g