noun
: the ratio of the total surface of a substance (as an adsorbent) to its volume : surface area (as of a finely divided powder) per unit mass
noun
: the ratio of the total surface of a substance (as an adsorbent) to its volume : surface area (as of a finely divided powder) per unit mass
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012