"a pressure drop of one kilogram per square centimetre" kilogram per square centimetre is not a valid pressure unit, the appropriate but old unit is perhaps kilopond per square centimetre.
Unit missing
editThe measurement unit of Kv should be described. It is not "1" and therefore essential for a correct measurement. Choose SI units. --Helium4 (talk) 14:31, 24 May 2015 (UTC)