Science / Chemistry / Penetration: Electrons in penetrating orbitals can reach the nucleus. The n and ell quantum numbers determine how well an orbital penetrates. Lower n and lower ell values mean better penetration. A low n value means the orbital is small. A low ell value means the orbital has fewer nuclear nodes (planes that pass through the nucleus where the probability of locating the electron is zero). In order of decreasing penetration, the subshells are s > p > d > f. A 1s orbital penetrates better than a 2s orbital.
Penetration Adjective Synonyms: piercing, perforation, puncturing, incision, puncture, penetrating, inroad, entry, entrance
Entertainment / Video Games / Market Penetration: The ratio of installed base versus population. (People who buy a product vs. People who do not.) MORE
Business / Finance / Market Penetration-Share: Used in the context of general equities. Percent of trading volume in a stock that a particular market maker trades. MORE