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The drop is an approximated 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 and in organic synthesis. The abbreviations gt or gtt come from the Latin noun gutta ("drop").
Carlton W. Ulbrich developed a more general formula in 1983 taking into account that a drop is spherical if D <1 mm and an ellipsoid whose horizontal axis gets flattened as D gets larger. It is mechanically impossible to exceed D = 10 mm as the drop breaks at large diameters.
There are commercial tubes for stalagmometric method in three sizes: 2.5, 3.5, and 5.0 (mL). The 2.5-mL size is suitable for small volumes and low viscosity, that of 3.5 (mL) for relatively viscous fluids, and that of 5.0 (mL) for large volumes and high viscosity. The 2.5-mL size is suitable for most fluids. [6]
2 hints = 1 drop drop: dr., gt., gtt. 1 ... 1 fluid dram or 5 mL [10] most common size: 80 minims or 3 mL [17] 1 fluidrachm or 4 mL, [11] or 3.75 mL [18]
It is the same concept as volume percent (vol%) except that the latter is expressed with a denominator of 100, e.g., 18%. The volume fraction coincides with the volume concentration in ideal solutions where the volumes of the constituents are additive (the volume of the solution is equal to the sum of the volumes of its ingredients).
The limit of this formula, as α goes to 90°, gives the maximum weight of a pendant drop for a liquid with a given surface tension, . m g = π d γ {\displaystyle \,mg=\pi d\gamma } This relationship is the basis of a convenient method of measuring surface tension, commonly used in the petroleum industry.
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• Volume Median Diameter (VMD) DV0.5 and Mass Median Diameter (MMD) Drop size expressed in terms of the volume of liquid sprayed. Drop size measured in terms of volume (or mass), with 50% of total volume of liquid sprayed drops with diameters larger than median value and 50% with smaller diameter. Drop sizes are stated in micrometers (μm ...