Quote:
Originally Posted by schwefel  I did some searching, on here and am not finding much.
I am looking for the formula for determining the temperature compensation for developers. Based on what I remember from chemistry class, I came up with the following formula:
(10th root of 2)^ΔT for Celcius.
[10th root of 2 raised to the differece in temperature]
When looking at some of the charts I found online, it does not match up.
Anyone out here know the formula?
Thanks,
Jason
Jason |
Yes, Jason: The Arrhenius Rate Law is applicable
Rate = A exp(-B/T)
The constants A and B in the Arrhenius rate law are empirical and differ from one reaction to another. However, the empirical values of B are found to be similar for many chemical reactions. One result of this similarity is the useful generalization that for many reactions which occur near room temperature, a temperature increase of 10oC approximately doubles the rate of the reaction.
Reference:
http://www.ualberta.ca/~jplambec/che/p102/p02151.htm
I use algebra to obtain the necessary constants from the published Kodak, Ilford, etc time and temperature development data for specific films and developers.