Density

• Formula for density?

  Density = mass / volume
• Density is a measure of how much mass a substance has, per unit of its volume.
• What are the units of density?

  Kg / m^3
• Symbol formula for density?

  p = m / v
• How to calculate the density of a solid..

  1 ~ Measure mass of solid using a balance.

  2 ~ If the shape is regular, measure volume geometrically.

  3 ~ If shape irregular - measure volume by adding it to a Eureka can filled with water.

  This will cause a volume of water equal to the volume of the solid to flow into measuring cylinder.

  4 ~ Use formula to calculate density.
• To convert g / cm^3 to kg / m^3 you

  have to..

  Multiply g / cm^3 value by 1000.
• To calculate density of a liquid experimentally..

  1 ~ Place empty measure cylinder onto a balance, then ‘zero’ the reading.

  2 ~ Add some of the liquid to the measuring cylinder.

  3 ~ Read volume of liquid from measuring cylinder.

  4 ~ Read mass from balance.

  5 ~ Use density equation to calculate density.
• Methods to reduce the uncertainty in experimental measurements of density..

  ~ While measuring density of liquids, use larger volume of liquid.

  ~ Take multiple measurements and calculate the mean.