hydrometry
n. நீர்ம எடைமான ஒப்பீட்டறுதிப்பாடு.
Hy*drom"e*try, n. Etym: [Cf. F. hydromètrique.] 1. The art of determining the specific gravity of liquids, and thence the strength of spirituous liquors, saline solutions, etc. 2. The art or operation of measuring the velocity or discharge of running water, as in rivers, etc.