Quantitative laws in biological chemistry / by Svante Arrhenius.

  • Arrhenius, Svante, 1859-1927.
Date:
1915
Catalogue details

Licence: In copyright

Credit: Quantitative laws in biological chemistry / by Svante Arrhenius. Source: Wellcome Collection.

    27/184 (page 11)
    to use the curve for finding values by means of interpolation. Therefore in all the curves which represent the velocity of reaction as dependent on temperature, I have taken as the ordinate jy=Tog K, and when the interval of temperature was relatively great, I have drawn the curve giving the exact equation (see Fig. io). Something similar has been done when the progress of digestion with time (cf. Fig. 8) has been graphically represented. In this case the square root of the time, J~t, has been chosen as abscissa. If the rule of Schutz were absolutely strict the representative curves, giving the digested quantity as ordinate, ought to be straight lines. But this is only approximately true; it holds only for small values of the time t. This is easily verified by the eye if we follow the curve representing the exact formula, and drawn in the figure, down to values in the neighbourhood of the origin. In the diagrams, indicating the change of the velocity of reaction, K, with temperature, I have drawn many lines representing different substances. This has been done in order to save space and also to give a more general view of the phenomenon re- presented. But this concise representation has only been possible by changing the origin. This is indicated for each curve by a formula expressing how many centigrade degrees of temperature have to be added to that given by the abscissa, in order that the figures may represent the observations. In one case the scale is reduced to the half magnitude, which