A new technique has made it possible to determine fluid densities by measuring sound velocity transmission. Until the oscillator technique was available, measuring density was too complicated or inaccurate for routine laboratory use. The scientific interest in variables like blood density depends on the availability of a suitable and simple method. This review summarizes recent work performed with this technique. Since the introduction of the mechanical oscillator technique for continuous recording of fluid density, a significant amount of experience has accumulated. Blood density is proportional to hematocrit, or more exactly, to the total protein concentration of blood, although blood density is only minimally influenced by other plasma solutes. ![]() ![]() The classical technique to measure the density of fluids involves determining mass and volume. Density is defined as mass per unit volume.
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