# Mathematics Seminar

## Why is 1 gallon = 231 in^{3}?

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OK, so 231 = 3 x 7 x 11 ... why choose that number?

A search on the web revealed that our present (U.S.) liquid gallon

is based on the old English "wine gallon"

(aka the "Queen Anne gallon"):

http://www.unc.edu/~rowlett/units/custom.html

But WHY is it 231 cubic inches?

I finally gave up on finding the answer myself and

appealed to "Dr. Math":

http://mathforum.com/dr.math/.

The answer I received from "Dr. Rick" pointed me to the following:

http://www.todd.demon.co.uk/encyc/measures1.htm