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 air, specific and/or surface:
“I remember when I was first assigned to jets. I said to the colonel, “Colonel, I joined this man’s air force to fly an airplane. But nobody’s gonna hitch me to no Roman candle.””
—Kurt Neumann (1906–1958)
“I was asking for something specific and perfect for my city,
Whereupon lo! upsprang the aboriginal name.
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Rich, hemm’d thick all around with sailships and steamships, an
island sixteen miles long, solid-founded,”
—Walt Whitman (1819–1892)
“We tend to be so bombarded with information, and we move so quickly, that there’s a tendency to treat everything on the surface level and process things quickly. This is antithetical to the kind of openness and perception you have to have to be receptive to poetry. ... poetry seems to exist in a parallel universe outside daily life in America.”
—Rita Dove (b. 1952)