Page 120 - Illustrated Pocket Dictionary of Chromatography

L

laminar flow A condition found where a fluid in a confined area
(e.g., tubing) is moving at a velocity such that the flow profile forms
a smooth and well-defined series of streamlines that are invariant with
time.

Laminar flow is a smooth flow profile with the linear velocity at the walls being
zero and the maximum flow velocity at the center.

lamp Term often used interchangeably with the term “source”; indi-
cates the component in a detector that is responsible for generating
a constant energy flux through the sample. For single fixed-wave-
length lamps the output is determined by the choice of element. For
example, detection of l= 229 requires a cadmium lamp.
langmuir isotherm An isotherm describes the equilibrium distri-
bution of a solute molecule between the stationary phase, C s, and the
mobile phase, C m, or K = C s/C m. The surface concentration in a Lang-
muir isotherm is mathematically expressed as:

C s = [K ¥ Q ¥ C m ] [1 + (K ¥ C m )]

See isotherm.

Illustrated Pocket Dictionary of Chromatography, by Paul C. Sadek.
ISBN 0-471-20021-2 Copyright © 2004 John Wiley & Sons, Inc.
119