Weights and measures [J]
Jar: Spanish measure of capacity. In Huelva = 2 cuartillos and, in Mexico = 8,212 liters.
Jeme: Unit equivalent to the distance between the end of the thumb and the index finger, extended as far as possible.
Jolsa: Measurement of length = 6 feet = 1,781 m.
Jornal: Old surface unit = to the land that a day laborer worked in one day.
In Alicante and Almería = 48,041 a.
In Lleida = 43.58 a.
In Barcelona = 48.96 a.
Jornal de meadow: Spanish agrarian measure, in Lérida = 8,722 a.
July: practical unit of electrical work. It corresponds to the number of calories produced during one second, by an ampere current in a circuit of 0 ohm resistance, or what is equivalent to the volt coulomb or volt ampere second.
1 joule = 10 7 erg second = 0.00024 kilocalories = 0.1019 kgm = 0.239 british thermal unit = 0.737 foot pound = 0.00136 CV = 0.009806 poncelet = 0.00134 HP