None, really, because a gallon is not a metric unit. A litre is the appropriate unit to use for measuring volumes.
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A pipe has the shape of a cylinder; just use the formula for the volume of a cylinder. In metric units, you have the advantage that the units are consistent. For example, if the radius and height of the cylinder are measured in decimeters, the volume will be in cubic decimeters (= liters).
That one!
Metric ruler
To find 5 percent of one gallon, you would first convert one gallon to its equivalent in smaller units, such as ounces. Since one gallon is equal to 128 fluid ounces, you would then calculate 5 percent of 128, which is 6.4. Therefore, 5 percent of one gallon is 6.4 fluid ounces.
The gram.