A number of different units of measurement were used in Argentina as its national system was derived from Spanish Castillian. The metric system was legally optional since 1863 and has been compulsory since 1887.^{[1]}^{[2]}

Pre-metric units

A number of different units were used before 1887.^{[1]}

Length

A number of different units were used to measure length. These units varied from one province or city to another.^{[1]} In the province of Buenos Aires, one vara (yard) was 0.8666 m.^{[1]}^{[3]} Some other units used in the province of Buenos Aires are given below:^{[1]}^{[3]}

1 línea (line) = 1⁄432 vara

1 pulgada (inch) = 1⁄86 vara

1 palma (palm) = 1⁄4 vara^{[4]}

1 pié (foot) = 1⁄3 vara

1 braza (fathom) = 2 vara

1 cuadra = 150 vara

1 legua (league) = 6000 vara.

Railway measures

There were some other units used on the railways. One legua was equal to 600 varas (0.3231 mile). One milla was equal to 1.85 km (1.149 miles) ^{[4]}

Mass

Different units were used to measure mass. These units were vary from one province or city to another and, in the province of Buenos Aires, one libra (pound) was equal to 459.4 g while one "Libra de Farmacia" (apothecary pound) was equal to 3⁄4 libra or 344.5 g. Some other units in the province of Buenos Aires are provided below:^{[1]}

Although theoretically the metric system was compulsory, a survey in 1920 revealed the widespread use of both traditional Spanish units and US customary units (particularly in trade with the US).^{[6]}

References

^ ^{a}^{b}^{c}^{d}^{e}^{f}^{g}^{h}Washburn, E.W. (1926). International Critical Tables of Numerical Data, Physics, Chemistry and Technology. New York: McGraw-Hill Book Company, Inc. p. 2.

^Cardarelli, F. (2003). Encyclopaedia of Scientific Units, Weights and Measures. Their SI Equivalences and Origins. London: Springer. p. 7. ISBN978-1-4471-1122-1.

^ ^{a}^{b}Cardarelli, F. (2003). Encyclopaedia of Scientific Units, Weights and Measures. Their SI Equivalences and Origins. London: Springer. p. 161. ISBN978-1-4471-1122-1.

^ ^{a}^{b}^{c}^{d}^{e}^{f}^{g}^{h}Clarke, F.W. (1891). Weights Measures and Money of All Nations. New York: D. Appleton & Company. p. 10.

^Stratton, S.W (1920), Weights and Measures: Twelfth Annual Conference from Various States Held at the Bureau of Standards, Washington: Government Printing Office, pp. 117, 118