โ Scribed by R. Kronig; J. De Boer; J. Korringa
No coin nor oath required. For personal study only.
A theory of the composition of the earth's interior, propose d some years ago by Kuhn and Ritt mann, is subjected to a closer analysis. While the present authors agree with the principal point of this theory, viz. that the core of the earth consists of sol&r matter containing a considerable percentage of hydrogen, they believe it necessary to motivate more carefully the rapid change in the viscosity at a depth of 2900km, postulated by Ku hn and Ritt mann in order to interpret the well-known discontinuity in the propagation of seismic waves. The behaviour in question can be understood if the hydrogen changes there from a molecular to an atomic phase. At the hand of energy diagrams it is shown that a change of this kind indeed is plausible at a partial pressure of about 0,7.106 atm, the equilibrium density in the molecular phase being about 0,4 g/cm 3, that in the atomic phase about 0,8 g/cm 3. These values are compatible with the total pressure of 1,5.106atm, prevailing at a depth of 2900 km, and with a hydrogen content of the order of 10 per cent immediately below.
๐ SIMILAR VOLUMES
Constitutional theory of the past fifteen years has achieved a high level of sophistication, largely due to the influence of political philosophy. This development stems from the pressing need to provide a theoretical framework and justification for the activist rights-based jurisprudence of the War