Levitation method
The levitation method is used to determine the density of minerals and homogeneous particles of small size, such as granules and fibers. She's like the density determination by lifting the principle of Archimedes to Use, but does not require the measurement of forces, but only the determination of the equilibrium state.
The mineral to be examined is placed in a heavy liquid with a high density. At the beginning of the determination, the mineral should float on the heavy liquid. By slowly adding a liquid with a lower density and stirring at the same time, for example with the aid of a magnetic stirrer , the density of the heavy liquid is successively reduced. At the point where the mineral under investigation remains suspended, the density of the mineral and that of the liquid are the same. At this point, the density of the liquid and thus that of the mineral to be examined can be determined very precisely , for example in a pycnometer . The process is quite sensitive and also suitable for traces of minerals in the range <1 mg .
Individual evidence
- ↑ Juilfs, J .: Density measurement according to the floating method . For determining the absolute density of fibers. VS Verlag für Sozialwissenschaften, Wiesbaden 1960, ISBN 978-3-663-05605-8 , doi : 10.1007 / 978-3-663-05605-8_2 .