Mathematics Seminar

Why is 1 gallon = 231 in3?

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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"):

But WHY is it 231 cubic inches?

I finally gave up on finding the answer myself and
appealed to "Dr. Math":

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