A Comprehensive Treatise on Inorganic and Theoretical Chemistry

PLATINUM 67
C. E. Guye and H. Schapper 5 measured the viscosity of platinum at different
temp, and found that with wires 23 cms. long, and 0*8117 mm. diameter, the damping
coeff. c, the period of oscillation, O seconds, and the second elastic modulus, N,
were :
10O° 50° 0° 180° —195°
O 2-976 3-457 4-596 4-276 3024
O 1143 1135 1133 1123 1111
N x IO- 11 . . 5-769 6-698
B. Gutenberg and H. Schlechtweg gave 1-7 XlO 8 c.g.s. units at ordinary temp.
CE. Guye and S. Mintz studied the effect of temp, on the viscosity, and found
that in passing from a high to a low temp, the original logarithmic decrements
are not obtained. These differences are smaller the higher is the temp. S. Virtel
studied the resistance law for the motion of sub-microscopical particles through
gases ; and F. Hirata, through viscous liquids. M. Born and O. F. Bollnow
calculated the cohesive force of the atoms in the space lattice to be 5'62XlO 11
dynes per sq. cm.
T. W. Richards fl calculated for the internal pressure 347,00O megabars at 20° ;
and this value is exceeded only by tungsten. J. H. Hildebrand and co-workers,
and Jt. H. Mehl studied the cohesive press.
D. V. Gogate and D. S. Kothari 7 gave 1819 for the surface tension of platinum
at 2000°. G. Quincke calculated the capillarity coeff. of hard, drawn platinum to
be 3025 grms.; annealed platinum, 2388 grms.; and molten platinum, 1 69-04 mgrms.
P. Palladino said that methylene bromide gives a concave meniscus with platinum ;
S. Hi. Bigelow and F. W. Hunter studied the effect of platinum "walls on the capillarity
of water, and of benzene ; and E. Warburg and T. Ihmori, the effect on the
capillarity of water. E. Degen discussed the wetting of platinum by water ; and
F. E. Bartell and M. A. Miller, the adhesion of water to the metal.
The diffusion of various gases, etc., in platinum -was studied by C. Matteucci, 8
and G. Moreau, and the subject is discussed in connection with the chemical
properties of the metal. W. Kettembeil, and A. Coehn and W. Kettembeil
observed that mercury does not diffuse in platinum, but N. T. M. Wilsmore found
that platinum amalgam will make platinum swell. W. C. Roberts-Austen observed
that platinum diffuses more rapidly in bismuth than it does in lead. The diffusion
coeff. for platinum in lead is 1-69 per sq. cm. per day, at 492°.
O. D. Chwolson 9 gave 2700 metres per second for the velocity of sound in
platinum ; A. Masson gave 2792-1 metres per second ; and G. Wertheim gave
2684*9 metres per second for drawn wires, and 2733-4 metres per second for annealed
wires. J. Kleiber found that the velocity of sound in metals is proportional to the
sq. root of the product of the sp. ht. and the linear coeff. of expansion. Relative
values were calculated by G. Wertheim on the assumption that the velocity in air
is unity :
Thin wiies Medium wires Thick wires
* * * •
Drawn Annealed Drawn Annealed Drawn Annealed
8-241 7-832 8-467 8-111 8-218 8-G74
REFERENCES.
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C. Barus, Amer. Joum. Science, (3), 36. 427, 1888 ; C. Benedicks, Zeit. phys. Chem.—Iiodenstein* s
Festschrift, 379, 1931 ; P. Berthier, TraiU des essais par la voie seche, Paris, 2. 629, 1834 ;
J. J. Berzelius, Z/ehrbuch der Chemie, Dresden, 3. 231, 1841 ; W. Biltz and K. Meisel, Zeit. anorg.
Chem., 198. 202, 1931 ; R.. Bottger, Tabellarische Uebersicht der specijischen Gewichte der Korper,
Frankfort, 1837 ; P. W. Bridgman, JProc. Amer. Acad., 58. 182, 1923 ; 64. 39, 1929 ; M. J. Brisson,
JPesanteur specifique des corps, Paris, 1787 ; O. J. Broch, Proces Verbausc Comit6 Internat. JPoids
Mesures, 210, 1878 ; O. J. Broch, H. St. C. Deville and J. S. Stas, ib., 149, 1879 ; J. Y. Buchanan,
Vroc. Roy. Soc, 78. A, 296, 1904 ; M. Chabaneau, Ann. Chirn. Phys., (1), 25. 4, 1798 ; E. I>. Clarke,
The Gas Bloivpipe, London, 93, 1819 ,- F. W. Clarke, A Table of JSpectfie Gravity, London, 15,
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