elutriation

n. cleaning by rinsing with water, purifying with water, rinsing

Elutriation, also known as air classification, is a process for separating lighter particles from heavier ones using a vertically-directed stream of gas or liquid (usually upwards). This method is profoundly used for particles with size (>1ųm) The smaller or lighter particles rise to the top (overflow) because their terminal velocities are lower than the velocity of the rising fluid. The terminal velocites of any particle in any media can be calculated using Stoke's Law given by u0A =d2Ag (ρA − ρ) /18ü
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(n.)
The process of elutriating; a decanting or racking off by means of water, as finer particles from heavier.
  

n.
چھانٹ, چھٹاؤ, شوب, دھوب, صفائي, نتھراؤ

elutriation
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