Densimeter consisting of a thin glass globe that is weighed in a gas to determine its density

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Dasymeter \Da*sym"e*ter\, n. [Gr. dasy`s rough, thick + -meter.] (Physics) 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.

Wiktionary Word definitions in Wiktionary
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.

WordNet Word definitions in WordNet
n. densimeter consisting of a thin glass globe that is weighed in a gas to determine its density

Wikipedia Word definitions in Wikipedia
A dasymeter was meant initially as a device to demonstrate the buoyant effect of gases like air; as shown in the pictures on the right. A dasymeter which allows weighing acts as a densimeter used to measure the density of gases .