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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. ==Principle== 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.) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「dasymeter」の詳細全文を読む スポンサード リンク
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