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1 gtt Metric = 0.05 ml
1 ml = 20 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 milliliter of water provided by HyperDictionary
A measure of capacity in the metric system, containing the thousandth part of a liter. It is a cubic centimeter, and is equal to 0.061 of an English cubic inch, or to 0.0338 of an American fluid ounce.