A 2Adp

The packing constant (A) is an empirical term depending on the shape (spherical or irregular) of the packing material and the packing efficiency, and reaches a minimum value =0.5. For open-tubular column there is no 'A' term.

Longitudinal molecular diffusion Solute molecules diffuse in a longitudinal direction (i.e. along the column axis) according to Fick's law of diffusion. The amount of band spreading is directly proportional to the coefficient of diffusion (DM) of the solute molecules in the mobile phase, and inversely proportional to the mobile phase flow rate. An obstruction factor is introduced to account for the restricted diffusion in a packed bed. Hence:

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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