assuming you are talking 1/2" on the inside diameter, or ID, then the answer is:
length = 3000 feet x 12 inches/foot = 36000 inches
Area = pi * 0.25^2 = 0.196 square inches cross-section
volume = length x area = 36,000 x 0.196 = 7068.58 cubic inches
Now convert this into gallons:
1 gallon = 231 cubic inches
7068.58/231 = 30.6 gallons
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A 150-gallon drum contains 0.0036 gallon per cubic inch.
6.23377 US gallons.
1 sq ft = 144 sq inches 1 sq ft x 1 inch deep = 144 cubic inches / (231 cubic inches per gallon) = 0.6234 gallon (rounded)
There are approximately 0.264 gallons in 1 kilogram.
A fourteen inch pot typically holds about 5-7 gallons of soil, depending on its shape and depth. It is always best to measure the pot's volume directly by filling it with water and pouring that water into a gallon-measuring container for an accurate estimation.