English to Russian Science Medical: Pharmaceuticals каскадный импактор�

The cascade impactor for measuring particle sizes is constructed of a succession of jets, each followed by ***an impaction slide***, and is based on the principle that particles in a moving air stream impact on a slide placed in their path, if their momentum is sufficient to overcome the drag exerted by the air stream as it moves around the slide. As each jet is smaller than the preceding one, the velocity of the air stream and therefore that of the dispersed particles are increased as the aerosol advances through the impactor. Consequently, smaller particles eventually acquire enough momentum to impact on a slide, and a complete particle size classification of the aerosol is achieved.