Math CentralQuandaries & Queries


Question from John:

How many feet of one inch pipe would it take to hold 30 and 40 gallons of water?

Imperial gallons please.

Hi John,

There are 277.419547 cubic inches.

The volume of a cylinder is π r2 h where r is the radius, h is the height and π is approximately 3.1416.

If the inside diameter of the pipe is 1 inch then for 30 gallons you have

π (1/2)2 h = 30 × 277.419547


h = 30 × 277.419547/(π/4) = 10596.65 inches

which is 883 feet.


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