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Experimenters are the striking force of science. The experiment is a question which science puts to nature. The measurement is the registration of nature's answer. But before the question is put to nature, it must be formulated. Before the measurement result is used, it must be explained, i.e., the answer must be understood correctly. These two problems are obligations of the theoreticians.

A model for mass transfer processes in column apparatuses has been done. The model may be modified for different volume source (chemical reaction, interphase mass transfer). The using of the average velocities and concentration permits to solve the scale-up problem. A hierarchical approach for model parameter identification has been proposed.

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