By B. Straumanis, M.E. Jirgensons
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Extra resources for A Short Textbook of Colloid Chemistry
Soc. A 86, 6 3 1 , 6 3 2 (1912). ( 2) I. N. STRANSKI; Discuss. Faraday Soc. No. 5, 13 (1949). 3 <> M . STRAUMANIS; Z. physik. Chem. Β 13, 3 1 7 ( 1 9 3 1 ) ; 19, 64 (1932); 26, 246 (1934): 30, 132 (1935). Α . EISENLÖFFEL and I. Ν . STRANSKI; Metallkunde 41, 10 (1950). <*> G . W . STEWART; Phys. Rev. 27, 104 (1926); 30, 2 3 2 (1927); 31, 1 (1928). 48 INTERFACIAL PHENOMENA molecules on the opposite side (the action of air is very weak). The liquid is under pressure to some extent, because the molecules of the outside layers are pressing on the inside of the liquid.
Another common term is specific viscosity ; this is the rise in viscosity of the solvent produced by the dissolved substance. The specific viscosity ^ s p = ^ r e i - l , or We can now try to measure the viscosities of the colloids we have prepared. For this we need a suitable viscometer, a thermostat, and a stopwatch. The viscometer must be quite clean and dry. It is fastened vertically in the thermostat. 5Ό ml. of distilled water is now introduced into the wider tube, and the water pulled (by applied suction) over the mark of the upper bulb ; by releasing the suction the water is allowed to flow back through the capillary.
The osmotic pressure of colloids is small because it is a colligative property, depending only on the number of particles present in the solution. c\M. 13 (6) < > A. WESTGREN; Z. anorg. Chem. 94, 193 (1916). E. F. BURTON; The Physical Properties of Colloidal Solutions: 3rd ed. , London 1938). g. if the same amounts of sugar and albumin are dissolved in two equal volumes of water, and if the osmotic pressures are determined at the same temperature, the pressures ρ will depend only on the molecular weights : the larger the molecules the smaller will be the measured osmotic pressure.