Definition of pycnometer in English English dictionary
a vessel used to determine the specific gravity of a liquid; a specific gravity bottle
The pycnometer (from the Greek puknos, meaning "density", also called pyknometer or specific gravity bottle), is a flask with a close-fitting ground glass stopper with a fine hole through it, so that a given volume can be accurately obtained. This enables the density of a fluid to be measured accurately, by reference to an appropriate working fluid such as water or mercury, using an analytical balance
A specific gravity bottle; a standard flask for measuring and comparing the densities of liquids