a the negative logarithm of the ionization constant (K) of an acid, the pH of a solution in which half of the acid molecules are ionized. Found on http://www.encyclo.co.uk/local/21001
The PK is a family of 7.62 mm Kalashnikov light and medium gas-operated automatic air-cooled machine-guns, produced since 1964, mounted as a secondary armament on many Russian AFVs (such as the PKT), and used by infantry (the PK, PKS and PKM variants). The PK family are chambered for the 7.62 mm x 54R Soviet cartridge which they take from a belt fe... Found on http://www.probertencyclopaedia.com/browse/FMP.HTM