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Measuring the density of cubes of Aluminium and Brass

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                        MEASURING THE DENSITY OF A CUBE

Aim: To measure the mass and volume of an aluminium cube and a brass cube in order to find the density of each cube using the equation (density = mass/volume).

Equipment: Ruler, triple beam balance, electronic balance, measuring cylinder, aluminium cube and brass cube.

Method of measuring mass:

  1. Place the aluminium cube on top of the triple beam scale.
  2. Move the triple beam weights till both weights line up.
  3. Record the mass of the cube.
  4. Repeat steps 1-3 for brass cube.
  5. Place the aluminium cube on top of the electronic scale.
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       53.8 +/- 0.05

       58.7 +/- 0.05

Electronic scale

       53.8 +/- 0.05

      58.7 +/- 0.05




      2 +/- 0.05

     2 +/- 0.05


      2 +/- 0.05

     2 +/- 0.05





Ruler and calliper:

Aluminium: 2cm±0.05cm per side

Percentage uncertainty =0.05/2=2.5%     2.5 X 3= 7.5%

Absolute uncertainty= 7.5% x 2= 0.15cm

Volume= 2^3=8cm^3 ± 0.15cm^3

Brass: 2cm±0.

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In this experiment our results were not very accurate because of the 25% uncertainty, we could improve our precision and accuracy of our results by:

  • Used different people to measure the cube in order to get a more precise result.
  • Used better equipment to improve accuracy.
  • Repeat the water displacement test to increase accuracy by using an average.
  • Keep constant room temperature in order to keep the metal density constant.
  • Try different metals to obtain a variety of results to compare.

Vibhuthi WickramagePhysicsDensity of a cube

...read more.

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