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1 gtt Imp. = 0.000026 gal
1 gal = 38,369.63 gtt Imp.
Definition of U.K. drops of water provided by Dictionary.com
a small quantity of liquid that forms or falls in a spherical or pear-shaped mass; globule
Definition of US gallon of water provided by WikiPedia
the US gallon is defined as 231 cubic inches (3.785 l), which is used in the US and some Latin American and Caribbean countries