Dasymeter n. : An instrument for testing the density of gases, consisting of a thin glass globe, which is weighed in the gas or gases, and then in an atmosphere of known density.

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Taxonomy
dasymeter, gas, density, sphere, free encyclopedia, formula, mass density, scales, buoyancy, density of gases, Principle, search, standard pressure, reduced pressure, drawing, german, Apparatus, acts.

Defination from the web:
dasymeter was meant initially as a device to demonstrate the buoyant effect of gases like air; as shown in the pictures on the right. ... Retrieved from "http://en.wikipedia.org/wiki/Dasymeter" ...