IF I HAVE A 12" DIA TUBE WITH 1/4" WALL AND 72" IN LENGTH HOW MANY GALLONS OF WATER WILL THIS HOLD

HEIDI
OUT OF SCHOOL
OTHER

THANK YOU



Hi Heidi,

The volume of a cylinder is

pi r 2 h where r is the radius, h is the height and pi is approximately 3.14159.

First I assume by the way you worded the question that the tube has an outside diameter of 12". Thus the inside diameter is 11.5" and thus the inside radius of

r = 11.5/2 inches = 5.75 inches Hence the volume is pi r 2 h = 3.14159 x 5.75 2 x 72 = 7478.5613 cubic inches.

Now you need to decide what kind of gallons you want. One British imperial gallon is 277.42 cubic inches and one U.S. gallon is 231 cubic inches. Thus your tube holds

 7478.5613/277.42 = 26.96 British imperial gallons or  7478.5613/231 = 32.37 U.S. gallons

Penny

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