Which material has the lowest density?

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Multiple Choice

Which material has the lowest density?

Explanation:
Density tells us how much mass sits in a given volume. Among common metals here, aluminum has the smallest density, about 2.70 g/cm³ at room temperature, so for the same sized piece it would weigh less than the others. Copper, iron, and lead have densities roughly 8.96, 7.87, and 11.34 g/cm³ respectively, all higher than aluminum. That’s why aluminum is the lowest-density option. In robotics, lighter materials often help with speed and efficiency, though you also weigh strength, stiffness, and durability for the job at hand.

Density tells us how much mass sits in a given volume. Among common metals here, aluminum has the smallest density, about 2.70 g/cm³ at room temperature, so for the same sized piece it would weigh less than the others. Copper, iron, and lead have densities roughly 8.96, 7.87, and 11.34 g/cm³ respectively, all higher than aluminum. That’s why aluminum is the lowest-density option. In robotics, lighter materials often help with speed and efficiency, though you also weigh strength, stiffness, and durability for the job at hand.

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