Experimental determination of dispersion coefficient from a pulse input

Experimental Determination of Dispersion Coefficient from a Pulse Input 

Within the integrals of the second and third terms on the right-hand side of this equation, t is a constant. The second term may therefore be written  

These relationships can be applied either to the C versus t curve directly or to the 

If we have a large number of data points equally spaced at a time interval At, the above relationships for mean and variance may be written in finite difference form  

Relatively few data points but each concentration C, measured instantaneously at time tj (Fig. 2.17a) 

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