87. 7 Thermodynamics of reversible cell 7.7.1. Measurement of Electromotive forces(emfs (2)Weston standard cell Temperature-dependence of emf The original design was a saturated cadmium cell producing a convenient 1.018638 Volt reference and had the E(T)N=1.01845-405×103(7/K advantage of having a lower temperature 293.15)-95×107(TK-293.15)2+1 coefficient than the previously used 108(7/K-29315) Clark cellE(T) /V = 1.01845 – 4.05 10-5 (T/K – 293.15) – 9.5 10-7 (T/K –293.15)2 + 1 10-8 (T/K –293.15)3 Temperature-dependence of emf The original design was a saturated cadmium cell producing a convenient 1.018638 Volt reference and had the advantage of having a lower temperature coefficient than the previously used Clark cell (2) Weston standard cell 7.7.1. Measurement of Electromotive forces (emf's) §7.7 Thermodynamics of reversible cell