Beyond the Atom |
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actinium active deposit amount atomic weight Avogadro's constant Brownian movement canal rays charge carried chemical cloud cubic centimetre curves decay deflected detected direct discovery droplets earth effect electric field electron electropositive elements energy ether experiment experimental fact fall to half-value fluorescent formula gases gives glass grains gram of radium half value heat helium hydrogen atom ionic charge ionizing ions J. J. Thomson kathode rays known light liquid magnetic field mass means measured method microns milligram millimetre million minute Mme Curie molecular motion nature negative charge number of molecules observed obtained oxygen penetrating photographic physical plate polonium positive charge pressure Prof properties radio-active radio-active changes radium bromide radium emanation ring Rutherford and Soddy showed solution spectroscope spectrum speed spinthariscope ẞ particles ẞ ray substances temperature theory thorium emanation trace transformed uranium vacuum tube vapour velocity vessel wire X-rays
Popular passages
Page 113 - As for the future, we may say with equal certainty, that the inhabitants of the earth cannot continue to enjoy the light and heat essential to their life for many million years longer, unless new sources, now unknown to us, are prepared in the great storehouse of creation.
Page 13 - We have seen that the very different circumstances in which different molecules of the same kind have been placed have not, even in the course of many ages, produced any appreciable difference in the values of these constants. If, then, the various processes of nature to which these molecules, have been subjected since the world began have not been able in all that time to produce any appreciable difference between the constants of one molecule and those of another, we are forced to conclude that...
Page 128 - In accord3. That the mean spacing of the chemical atoms of which solids and liquids consist lies somewhere in the neighbourhood of a tenth- metret. This, like the last, was an estimate. 4. That the number of molecules in a cubic centimetre of gas at standard temperature and pressure is somewhere in the neighbourhood of a uno-twentyone. This follows as a corollary from (2).