an instrument used to measure the density, or relative density, of a liquid. It usually consists of a glass (or plastic) bulb, weighted at the bottom so that it floats upright, and fitted with a stem carrying a scale. The point on the scale that is level with the surface of the liquid indicates the (relative) density of the liquid., vedelike tiheduse määramise riist; mõõdab vedeliku tihedust selle järgi, kui sügavale vedelikku ta ujuma jääb