If a gallon of paint covers a 25.0 m2 wall, what is the thickness of the paint?

1 Answer
Andy Y.
Mar 25, 2016

The paint is 0.1512 millimeters thick.

Explanation:

If, instead of painting a wall, let's suppose we are pouring the paint into a box. We know the surface of the "floor" of this box would be 25.0 m2 and have an unknown height of x meters. So we need to solve the volume of this box as

V=area×height=25 m2⋅x m

Now, we were given a gallon of paint. Google told me that

1 gal=3.78×10−3 m3

So,

V=25 m2⋅x m=3.78×10−3 m3, dividing both sides by 25 gives the "height" (or thickness), x,

x=1.512×10−4 m=0.1512 mm

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