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1 in3 / cu in = 196.64 gtt
1 gtt = 0.0051 in3 / cu in
Definition of cubic inches of water provided by WikiPedia
The cubic inch is a unit of measurement for volume in the Imperial units and United States customary units systems. It is the volume of a cube with each of its three dimensions (length, width, and depth) being one inch long. The cubic inch and the cubic foot are still used as units of volume in the United States, although the common SI units of volume, the liter, milliliter, and cubic meter, are also used, especially in manufacturing and high technology. One cubic foot is equal to exactly 1,728 cubic inches because 123 = 1,728.
Definition of medical drop of water provided by Merriam-Webster
the smallest practical unit of liquid measure that varies in size according to the specific gravity and viscosity of the liquid and to the conditions under which it is formed.