Critique of the Kassel theory

The derivation is much more complicated than those outlined previously, especially when the quantum version is considered. Both versions are a vast improvement on the previous theories, and predict that 1 /klst versus 1/[A] should be a curve, and that the plot of loge kx versus 1/7 should be linear. Both predictions are verified by experiment. 

More advanced theories continue to make further improvements. 

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