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Appendix A – Some Common Units Used in Hydrometallurgy

SI Base Units
Physical quantity SI name SI unit abbreviation
length metre m
mass kilogram kg
time second s
electric current ampere A
thermodynamic temperature Kelvin K
amount of substance mole mol
SI Derived Units
Physical quantity SI name SI Unit SI Base Units
force newton N kg m s-2
pressure pascal Pa N m-2
energy/work/heat joule J N m
power watt W J s-1
electric charge
charge of a mole of electrons
coulomb
Faraday
C
F
A s
96484.6 C/mole of electrons
electric potential (electromotive force) volt V J C-1
electric resistance ohm V A-1
Celsius temperature degrees Celsius °C K (1°C = 1 K)
Other Common Units
Physical quantity Unit name Symbol Value in SI units
time minute, hour, day, month, year min, h, d, mon, y 60, 3600, 86400; 1 y = 365 d
length centimeter, millimeter cm, mm 0.01 m, 0.001 m
length micron, nanometer m, nm 10-6 m, 10-9 m
volume litre, millilitre L, mL 10-3 m3, 10-6 m3
volume litre dm3 (0.1 m)3 = 0.001 m3
mass tonne, gram, milligram t, g, mg 103 kg, 10-3 kg, 10-6 kg
mass Troy ounce oz Troy 0.03110349 kg
concentration in solution molar M mol/L or mol/dm3
concentration in solution molal m mol/kg (kg of solvent)
concentration in solution (none) g/L
density (none) g/mL 103 kg m-3
pressure kilopascal, atmosphere, pounds per square inch kPa, atm, PSI 103 Pa, 101325 Pa, 6894.76 Pa
pressure bar, atmosphere, Torr = mm Hg (1 atm = 760 Torr) bar, atm, Torr 105 Pa, 133.322 Pa

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Aqueous Pathways (DRAFT) Copyright © by Bé Wassink and Amir M. Dehkoda is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, except where otherwise noted.

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