Fahrenheit's hydrometer

Fahrenheit's hydrometer

[′far·ən‚hīts hī′dräm·əd·ər]

(engineering)

A type of hydrometer which carries a pan at its upper end in which weights are placed; the relative density of a liquid is measured by determining the weights necessary to sink the instrument to a fixed mark, first in water and then in the liquid being studied.

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.