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About these units
Drop (drop)
The drop is one of the oldest fluid measures and originally referred simply to the amount of liquid that naturally forms at the end of a dripping vessel. Because drop size depends on viscosity, surface tension, temperature, and orifice size, early medicine found drops inconsistent and unreliable. Modern medicine and chemistry sometimes define a drop as 0.05 mL, but this is only a convention used for standardized droppers—real drops can vary significantly. Despite its imprecision, the drop survives in everyday language, aromatherapy, essential oils, and household instructions ("add a few drops"). It exemplifies humanity's earliest attempts to quantify small volumes before scientific instrumentation enabled precise micro-measurement.
Board Foot (board foot)
A board foot is a unit of volume used in lumber, defined as a board measuring 1 foot long × 1 foot wide × 1 inch thick, equal to 144 cubic inches, or about 2.36 liters. The unit reflects a material-centric approach to volume: rather than measuring empty space, the board foot measures solid wood content, crucial for pricing logs, boards, and woodworking materials. Forestry operations, sawmills, and lumber yards rely heavily on board-feet calculations to estimate yields from logs, determine pricing, and evaluate timber resources. The unit persists due to deep integration with North American construction and carpentry practices.