Question

One gallon of paint (volume = 3.78E-3 m3) covers an area of 21.5 m2. What is the thickness of the paint on the wall?

Answer 1

If we assume that the height of the walls of the paint (its thickness) is uniform, we can express volume as

$$V=AH\rightarrow H=\frac{V}{A},\\\space\\ H=\frac{3.78\cdot10^{-3}}{21.5}=1.76\cdot10^{-4}\text{ m},$$

or 176 micrometers, or 0.176 mm.