The volume equivelent to a cube of one millimeter by one millimeter by one millimeter. More often referred to as a microliter as it is a millionth of a liter.
A US capacity measure (for liquid) equal to 4 quarts or 3.785 liters. Note also there are different measures of US dry gallons and UK gallons.
Cubic Millimeters to US Gallons (Liquid)
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