. On the Thermal Conductivities of Single and Mixed Solids and Liquids and their Variation with Temperature . 4 10 •o •0001 i •0054 •1062 The results of calculations of the conductivities of mixtures for which pQ = 1, andp = gif and -^ respectively, are given in the following curves, along with theobserved curves for mixtures of water and alcohol, and of vaseline and marble,and the curves for conductivity and resistivity following the linear law, for com-parison. The calculation gives conductivities always below the observed values,a result which is due in part, and it may be entirely, to the
. On the Thermal Conductivities of Single and Mixed Solids and Liquids and their Variation with Temperature . 4 10 •o •0001 i •0054 •1062 The results of calculations of the conductivities of mixtures for which pQ = 1, andp = gif and -^ respectively, are given in the following curves, along with theobserved curves for mixtures of water and alcohol, and of vaseline and marble,and the curves for conductivity and resistivity following the linear law, for com-parison. The calculation gives conductivities always below the observed values,a result which is due in part, and it may be entirely, to the neglect of the trans-verse transmission of heat from column to column of the model The agreementis, however, sufficiently near to justify the statements that the thermal conductivityof a substance is not greatly modified when it enters as one constituent in a physicalmixture, and that the thermal conductivity of a mixture depends directly on theamounts and conductivities of its constituents. * Encyclopaedia Metropolitan a, vol. 2, p. 486, 438 BR, C. H. LEES ON THE THERMAL CONDUCTIVITIES OP SOLIDS. v RQ% 40% 60% Constitution* 60% A reference to the values obtained for the thermal conductivities of solutions of agas or a solid in water, will show that the above law does not apply to cases in whichone constituent of the mixture changes its physical state on mixing. Further workIs necessary before any law can be stated, but it seems probable that if the thermalconductivity of the gas or solid when liquefied were known and used as that of thematerial entering into solution, the above law would be found to cover solution aswell as physical mixture. Part V. Change of Conductivities of Mixtures with Temperature, In order to determine the effect of temperature on the thermal conductivities otmixtures, experiments were made on several of the 50 per cent, mixtures of liquidsmentioned in the preceding section. They were carried out with the enclosedapparatus, fig. 11, p. 419. The o
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