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.
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