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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.
The Principle of Archimedes permits to derive a formula which does not rely on any information of volume: A sample, the big sphere in the images on the right, of known mass-density is weighed in vacuum and then immersed into the gas and weighed again. From the known mass density of the sample (sphere) and its two weight-values can be calculated the mass-density of the gas:
(The formula was taken from the article buoyancy and still has to be solved for the density of the gas.)
Construction and Use
History of the dasymeter
Was invented in 1650 by Otto von Guericke. Archimedes used a pair of scales which he immersed into water to demonstrate the buoyant effect of water. A dasymeter can be seen as a variant of that pair of scales, only immersed into gas.
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