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1 gal Imp. = 55,339.77 gtt
1 gtt = 0.000018 gal Imp.
Definition of U.K. gallons of water provided by TheFreeDictionary
A unit of volume in the British Imperial System, used in liquid and dry measure, equal to 4 quarts (4.546 liters).
Definition of US water drop of water provided by WikiPedia
The drop is a unit of measure of volume, the amount dispensed as one drop from a dropper or drip chamber. It is often used in giving quantities of liquid drugs to patients, and occasionally in cooking. The volume of a drop is not well-defined: it depends on the device and technique used to produce the drop, on the strength of the gravitational field, and on the density and the surface tension of the liquid