The volume of a sphere is 4/3 pi R3 .
If the diameter is 18 inches, then the radius is 9 inches.
Volume = 4/3 pi (9)3 = 3,053.6 cubic inches = 13.22 gallons.
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how much water may be in it. It may even be empty.
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About 208.292013 gallons of water.
A 2-inch diameter sphere has a volume of 4.189 cubic inchesA 1-inch diameter sphere has a volume of 0.5236 cubic inches.
45.9 US gallons.
33.51 cubic inches for a 4-inch diameter sphere.
150