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1 gtt Metric = 0.51 gtt Imp.
1 gtt Imp. = 1.97 gtt Metric
Definition of drops 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
Definition of U.K. drop of water provided by Dictionary.com
a small quantity of liquid that forms or falls in a spherical or pear-shaped mass; globule