Red-clay bricks have a density of approximately 2000 kg/m^3. Air has a density of 1 kg/m^3. Which of the following has the lowest mass. Choices: (I) 2 m^3 of bricks. (II) 4 m^3 of bricks. (III) 6000 m^3 of air. (IV) 10,000 m^3 of air. Your answer:.
The answer is: