Question

what is meaning of porosity ?
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Answer 1

Porosity or void fraction is a measure of the void(i.e. "empty") spaces in a material, and is a fraction of the volume of voids over the total volume, between 0 and 1, or as a percentage between 0% and 100%. Strictly speaking, some tests measure the "accessible void", the total amount of void space accessible from the surface (cf. closed-cell foam). There are many ways to test porosity in a substance or part, such as industrial CT scanning. The term porosity is used in multiple fields including pharmaceutics, ceramics, metallurgy, materials, manufacturing, hydrology, earth sciences, soil mechanics and engineering.
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Answer 2

POROSITY-:

THE MANNER OF HAVING MINURE INTERSTICES THROUGH WHICH LIQUID OR AIR MAY PASS......

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