HYDROMETRY
hydrometry, gravimetry
(noun) the measurement of specific gravity
Source: WordNet® 3.1
Etymology
Noun
hydrometry (uncountable)
(physics) The branch of hydrostatics dealing with the measurement of specific gravity using hydrometers
Source: Wiktionary
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.
Source: Webster’s Unabridged Dictionary 1913 Edition