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1 gtt Imp. = 1.2 gtt
1 gtt = 0.83 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 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