Common
FFF system
Humorous system of units
FFF system
The furlong–firkin–fortnight (FFF) system is a humorous system of units based on unusual or impractical measurements. The length unit of the system is the furlong, the mass unit is the mass of a firkin of water, and the time unit is the fortnight. Like the SI or metre–kilogram–second systems, there are derived units for velocity, volume, mass and weight, etc. It is sometimes referred to as the FFFF system where the fourth 'F' is degrees Fahrenheit for temperature. While the FFF system is not used in practice, it has been used as an example in discussions of the relative merits of different systems of units. Some of the FFF units, notably the microfortnight, have been used jokingly in computer science. The derived unit furlongs per fortnight has served frequently in classroom examples of unit conversion and dimensional analysis.
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