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Question: a calculation of density density is a derived unit which...

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A.      Calculation of Density


Density is a derived unit which is the ratio of the mass of a substance to the volume occupied by that mass.  Typical units are:  kg/m3, g/mL or g/cm3.

1.      Weigh the wooden block you measured in Part A using the balance.

2.      Determine the density of wood.  Complete Table 2. Include the correct number of significant figures and the uncertainty.  Write your final answer in scientific notation.  Compare your result to the accepted value.  Calculate the percentage error.  Comment on the accuracy.


Processing of Results

Table 1:  Results of block measurements



 (to nearest mm)


% uncertainty

Length of block



 ±0.5 mm (0.0005 m)


Width of block



±0.5 mm (0.0005 m)


Height of block



±0.5 mm (0.0005 m)


Volume (mm3)





*Volume (cm3)





Table 2:  Results for density of wood




% uncertainty

Mass of block (g)


±1 (g)


*Volume of block (in cm3)




Density of block (in g/cm3)




Density of block rounded to correct no. of sig figs




NB.  Accepted density of wood is:  0.6 g/cm3. * This row should be the same

Calculate the percentage error:  i.e., Percentage error =  measured value – accepted value  100%

                                                                                                   Accepted value

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