A US capacity measure (for dry material) equal to 4 quarts or 4.404 liters. Note also there are different measures of US liquid gallons and UK gallons.
US gal dry
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.
US Gallons (Dry) to Cubic Millimeters
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