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The van Deemter equation is a hyperbolic function that predicts that there is an optimum velocity at which there will be the minimum variance per unit column length and, thence, a maximum efficiency. The van Deemter equation was the result of the first application of rate theory to the chromatography elution process.
In engineering and physics, g c is a unit conversion factor used to convert mass to force or vice versa. [1] It is defined as = In unit systems where force is a derived unit, like in SI units, g c is equal to 1.
Isothermal Kovats index is independent of , any GC dimension or ß or carrier gas velocity , which compares favorable to retention time . Isothermal Kovats index is based on solubility S i {\displaystyle S_{i}} and vapor pressure P i {\displaystyle P^{i}} of compound i and n -Alkanes ( i = n {\displaystyle i=n} ).
Gas chromatography (GC) is a common ... Selecting the linear velocity is therefore the same compromise between the level of separation and length of analysis as ...
The components of the sample move through the column, each at a different velocity, which are a function of specific physical interactions with the adsorbent, the stationary phase. The velocity of each component depends on its chemical nature, on the nature of the stationary phase (inside the column) and on the composition of the mobile phase.
and dividing by the square differential in time, dt 2, to obtain the velocity squared of particle k. Thus for time-independent constraints it is sufficient to know the line element to quickly obtain the kinetic energy of particles and hence the Lagrangian .
To calculate the pressure drop in a given reactor, the following equation may be deduced: = + | |. This arrangement of the Ergun equation makes clear its close relationship to the simpler Kozeny-Carman equation, which describes laminar flow of fluids across packed beds via the first term on the right hand side.
The relationship between the linear velocity u of the liquid in the capillary and the applied electric field is given by the Smoluchowski equation as u = ϵ r ϵ 0 ζ E η {\displaystyle u=\epsilon _{r}\epsilon _{0}\zeta E\eta }