Methods of sieve analysis with particular reference to bone char
F. G. Carpenter, Victor R. Deitz · Journal of research of the National Bureau of Standards · 1950
The two values for the heat of dissociation differ by the rather large amount of 626 j. Cottrell and Wolfenden state th at their result is subj ect to considerable uncertainty, for it represents a difference between t\O expe rimental quantities and also rests upon a rather arbitrary extrapolation. Differences of extrapolation often do not affect th e temperatme coefficient , and it is perhaps significant that practically identical values of L,. C~, that is d( L,.HO) jdT, were obtained by the two methods. Cottrell and Wolfenden found L,.Ho to pass through zero at 26 C, in r easonably goo d agreement with 23 C at which the valu e of -log J{2 given in table 3 reaches a minimum.