Question

what is the specific gravity bottle?

Answer 1

A small bottle or flask used to measure the specific gravities of liquids; the bottle is weighed when it is filled with the liquid whose specific gravity is to be determined, when filled with a reference liquid, and when empty. Also known as density bottle; relative-density bottle.

Answer 2

The specific gravity bottle is another instrument (other than a hydrometer) used to measure specific gravity at 20 C. The bottle is weighed empty, filled with the liquid whose specific gravity is to be found, and then reweighed.