Density

• Density is the mass of a substance per unit volume.
• Density = M/V
• Density equation

  
• Solid = high density (particles are close together)
• Liquid = Lower density (More spaces)
• Gas = Least dense ( lower mass per unit volume)
• A block of 4g + 2cm^3 = 2g/cm^3
• A liquid of 0.01g/cm^3 + 100cm^3 = 1g
• A gas has 0.0001g/cm^3 + 10g = 100,000cm^3
• 1. Density of a regular solid = find volume (widthxlengthxheight)
  2. use a balance to find mass
  3. use equation D=M/V
  4. Put results in a table
• 1. Density of an irregular object= Fill a measuring cylinder with water that will cover object and record it
  2. find mass of object using a balance
  3. Place object in cylinder and find new volume
  4. new volume-old volume= volume of object
  5. D=M/V
• 1. Density of a liquid= Find mass of measuring cylinder with a balance
  2. measure out 20ml of water and find mass of water+measuring cylinder
  3. mass of water only = mass of water+cylinder - mass of cylinder
  4. Repeat for 40cm^3, 60cm^3, 80cm^3 & 100cm^3
  5. Find density for each volume then take an average
• When finding the density of an irregular object don't use your fingers to push a floating item down use a object such as a pencil