Determines the concentration of elements represented in the entrained fluid contaminant.


Related Terms

FORM FACTOR

  1. The ratio of the effective value of a periodic function, such as an alternating current, to its average absolute value.
  2. A factor that takes the shape of a coil into account when computing its inductance. Also known as the shape factor.
  3. The theoretical stress concentration factor for a given shape, for a perfectly elastic material.

NIGRE

Dark-colored layer formed between neat soap and lye during soap manufacture; contains more soap than lye, and a high concentration of salts and colored impurities.

MEMBRANE SEPARATION

The use of thin barriers (membranes) between miscible fluids for separating a mixture; a suitable driving force across the membrane, for example concentration or pressure differential, leads to preferential transport of one or more feed components.

LUDWIG-SORET EFFECT

A phenomenon in which a temperature gradient in a mixture of substances gives rise to a concentration gradient.

KNUDSEN VACUUM GAGE

Device to measure negative gas pressures; a rotatable vane is moved by the pressure of heated molecules, proportionately to the concentration of molecules in the system.

ISOCONCENTRATION MAP

Map or diagram of a liquid or gas system's concentration with respect to a single component of the system, shown by constant-concentration contour lines.

ISOBARIC ISOCONCENTRATION

Constant concentration values.

HYDROCARBON BLENDING VALUE

Octane number rating for a 20% blend of a hydrocarbon with a 60:40 mixture of isooctane:n-heptane, which has been recalculated for a hypothetical 100% concentration of the tested hydrocarbon.

HIGH-EFFICIENCY PARTICULATE AIR FILTER

An air filter capable of reducing the concentration of solid particles (0.3 millimeter in diameter or larger) in the airstream by 99.97%. Also known as HEPA filter.

EMISSION SPECTROMETER

Works on the basis that atoms of metallic and other particular elements emit light at characteristic wavelengths when they are excited in a flame, arc, or spark. Excited light is directed through an entrance slit in the spectrometer. This light penetrates the slit, falls on a grate, and is dispersed and reflected. The spectrometer is calibrated by a series of standard samples containing known amounts of the elements of interest. By exciting these standard samples, an analytical curve can be established which gives the relationship between the light intensity and its concentration in the fluid.

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