How large a surface area in units of square feet will 1 gall

How large a surface area in units of square feet will 1 gallon of paint cover if we apply a coat of paint that is 0.1 centimeter thick?

Solution

Square feet (surface area) is a two-dimensional unit. Gallons (volume) is a three-dimensional unit. They are completely different, and there is no way to convert between them.

However, if you meant cubic feet (volume), then the following conversions are true:

1 cubic foot = 7.48051945 US gallons
1 US gallon = 0.133680556 cubic feet