Density

• Density


  The amount of mass in unit volume. It tells us how tightly matter is packed together.
• Objects could have the same volume but have different densities
• Density formula

  Density = Mass / Volume
• Measuring density of a regular solid

  1. Measure width, length and depth

  2. Weigh on a balance scale to find mass

  3. Find volume
• Measuring volume of an irregular solid


  1. Place in Eureka can of water and measure volume of water displaced

  2. If smaller, observe change in water level in measuring cylinder
• Water's density is very close to 1g/cm^3
• If a solid sinks in water

  Its density is greater than 1g/cm^3
• If a solid floats in water

  Its density is less than 1g/cm^3
• Measuring mass of a liquid


  1. Measure mass of empty measuring cylinder

  2. Pour liquid into measuring cylinder and measure total mass

  3. Subtract mass of empty cylinder to find mass of liquid
• Measuring volume of a liquid


  Record reading on measuring cylinder