The volume (V) of a sphere equals 4 over 3 times 3.14 times its radius squared.
One cubic foot of water equals 7.48 cubic feet.
One meter equals 3.28 feet (I like working in feet instead of meters)
Volume works out to be 499.234 cubic feet.
499 cubic feet times 7.49 gallons per cubic foot equals 3,734.529 gallons.
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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.That's the volume of your sphere. We have no way of knowinghow much water may be in it. It may even be empty.
About 208.292013 gallons of water.
280 gallons of water.
A round pool with a 10-foot diameter and a 3-foot depth can hold up to 1,762 gallons of water.
A cylinder with a diameter of 19 inches and a height of 12 inches can hold up to 14.73 gallons of water.