# MCAT Physics Question — Lowest Density

• Reviewed By: Liz Flagge
• Which of the materials in table 1 has the lowest density?

 Material Volume (cm3) Mass (g) ice 2 1.86 mercury 4 21.6 iron 6 47.4 methanol 10 7.9

A. ice

B. mercury

C. iron

D. methanol

##### Click for Explanation

Density is calculated as mass divided by volume. On inspection, ice and methanol have densities less than 1, and mercury and iron have densities greater than 1. On closer inspection, ice has density ρ=0.93 g/cm3 and methanol has density ρ=0.79 g/cm3.

 Material Volume (cm3) Mass (g) ice 2 1.86 mercury 4 21.6 iron 6 47.4 methanol 10 7.9

A. ice, incorrect, ρ=0.93 g/cm3.

B. mercury, incorrect, ρ=5.4 g/cm3.

C. iron, incorrect, ρ=7.9 g/cm3.

D. methanol, correct, ρ=0.79 g/cm3.

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