Which phrase best describes air density?

A balsa wood wing has dimensions $27.5\mathrm{cm}$ × $6\mathrm{cm}$ × $0.15\mathrm{cm}$. If the density of balsa wood is $0.16g/{\mathrm{cm}}^3$, what is the mass of the wing?

Two cylinders, X and Y, are made of the same material and have equal masses. Cylinder X has a density of $8g/\mathrm{cm}{3}^3$ and cylinder Y has a density of $4g/\mathrm{cm}{3}^3$. Which best compares the volumes of cylinder X and cylinder Y?

Which statement is true about the mass and volume of all objects that sink when placed in water?

If you have two solid steel spheres and sphere $2_{}$ has twice the radius of sphere $1_{}$, how does the density of sphere $2_{}$ compare to that of sphere $1_{}$?

Given that a table tennis ball has a mass of $2.7g$ and a diameter of $40\mathrm{mm}$, what is the average density of the ball in $\mathrm{kg}/m^3$? (Assume the ball is a perfect sphere.)

A cylindrical specimen of brass has a diameter of $20 \mathrm{mm}$ and a height of $100 \mathrm{mm}$. If its mass is $0.27 \mathrm{kg}$, what is the density of the brass in $\mathrm{kg}/m^3$?