Aluminum has a density of 2.7 g/cm3. Copper has a density of 8.96 g/cm3. Which metal would you choose to build a model airplane? Why?
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Answer: Aluminium
Explanation: Aluminium metal has a lower density than copper. So, for the same volume of metal used to build a model airplane, the aluminium plane would be very lightweight while that of copper would be heavy. The lightweight airplane will fly easily.
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