Density of Various Objects
Type
Wood
Cube
Wood
Cylinder
Aluminum
Cube
Aluminum
Cylinder
Aluminum
Shot
Plastic
Cube
Plastic
Cylinder
Copper
Shot
Copper
Strips
Key:
Variable
L
W
H
DI
M
VH2O
Vcal
DH2O
Dcal
Da
%E
Measurements – use proper sig figs
W
H
Di
M
X
L
X
VH2O
Vcal
DH2O
Calculations
Dcal
Da g/cc
Dry: 0.5
Wet: 0.6
%E
X
X
X
X
X
X
X
X
2.70
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Meaning
Length
Width
Height
Diameter
Mass
Volume measured by water
displacement
Volume calculated by using dimensions
(LWH or r2H)
M/VH2O
M/Vcal
Accepted density of substance
Percent error of your best calculation.
%E= (Va – Ve)/Va (use closest density)
Clear:
1.2
White:
0.9
8.94
Evaluation Questions
1) Calculate the volumes and densities of the objects using the rules of significant digits.
2) Show the calculation for volume and both densities of the wood cylinder.
3) Volume can be calculated by measuring dimensions or getting water displacement. Explain the
advantage to each method.
4) Explain when you would apply the LWH method and when you would apply the water
displacement method.