Air Permeability Specific Surface

The air permeability specific surface of a powder material is a single-parameter measurement of the fineness of the powder. The specific surface is derived from the resistance to flow of air (or some other gas) through a porous bed of the powder. The SI units are m2·kg−1 ("mass specific surface") or m2·m−3 ("volume specific surface").

Read more about Air Permeability Specific Surface:  Significance, Methods

Famous quotes containing the words surface, specific and/or air:

    All beauties contain, like all possible phenomena, something eternal and something transitory,—something absolute and something particular. Absolute and eternal beauty does not exist, or rather it is only an abstraction skimmed from the common surface of different sorts of beauty. The particular element of each beauty comes from the emotions, and as we each have our own particular emotions, so we have our beauty.
    Charles Baudelaire (1821–1867)

    In effect, to follow, not to force the public inclination; to give a direction, a form, a technical dress, and a specific sanction, to the general sense of the community, is the true end of legislature.
    Edmund Burke (1729–1797)

    Having grown up in shade of Church and State
    Breathing the air of drawing-rooms and scent ...
    Philip Larkin (1922–1986)