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:
“He will place a tax on the air you breathe and on the bread you eat; he will give you a legislation which is as legitimate as it is unjust and instead of reasons, he’ll give you laws. These will grow in the course of time, until you no longer exist for yourselves but for others.”
—Franz Grillparzer (1791–1872)
“I was asking for something specific and perfect for my city,
Whereupon lo! upsprang the aboriginal name.
Now I see what there is in a name, a word, liquid, sane, unruly,
musical, self-sufficient,
I see that the word of my city is that word from of old,
Because I see that word nested in nests of water-bays, superb,
Rich, hemm’d thick all around with sailships and steamships, an
island sixteen miles long, solid-founded,”
—Walt Whitman (1819–1892)
“When we are in love, the sentiment is too great to be contained whole within us; it radiates out to our beloved, finds in her a surface which stops it, forces it to return to its point of departure, and it is this rebound of our own tenderness which we call the other’s affection and which charms us more than when it first went out because we do not see that it comes from us.”
—Marcel Proust (1871–1922)