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REFERENCE DATA Property Density* Specific heat* Electrochemical equivalent Resistivity (at 20°C) Temperature coefficient of resistance (at 0°C) Unit kg m~3 Jkg- 1 deg C-1 k g C - 1 ÙÉ¿ degC"1 Substance Aluminium 2.7 X103 910 2.8X10-8 3.8X10-3 Copper | Silver 1 8.9 XlO3 390 3.3X10"7 1.7X10"8 4.3X10-3 1.05 XlO4 1.118X10"6 Water 1.00X103 4.19X103 * Temperature variation to be neglected. General Constants Standard acceleration of gravity: g = 9.81 m s""2. Charge of one electron: e = 1.60X 10~19 C. Faraday's constant of electrolysis = 9.65XlO7 C per kilogram equiva- lent. Avogadro's number = 6.02 XlO28 molecules per kilomole. Permeability of free space μ0 = 4πχ 10~* 7 H m"1. Permittivity of free space e0 = 8.85X10" 12 F r 1 . s.t.p. = standard temperature and pressure. = 0°C and 760 mmHg. = 273 K and 1.013XlO6 N m"2. 1 litre - 10~3 m3. xi
