The New Physics and Its EvolutionK. Paul, Trench, Trübner, 1907 - 344 pages |
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absolute actinium action analogous appear atoms becomes bodies calorific cathode rays centimetre chemical Clausius complete conservation of energy considerable considered constant constitution contrary corresponding Crookes tube discovery dissociated domain Duhem Edition effected elastic electric electrolytes electromagnetic electrons endeavoured energy entropy enunciated equilibrium ether evolution exist experimental experiments fact fluids gaseous gases give given heat Hertz hydrogen hypothesis idea important ions J. J. Thomson kinetic theory known laws light liquid Lord Kelvin luminous Madame Curie magnetic field magnitude mass matter measure mechanics metals method metre millimetre molecular molecules moreover movement nature obtained optical ordinary particles particular phenomena phenomenon physicists physics possible precision present pressure principle of Carnot produced Professor propagation properties quantity question radiations radioactive radium reality regard relation remarkable researches scholars seems solid solution speed substances succeeded temperature thermodynamics tion transformations tube unit variations velocity vibrations vis viva wave-lengths waves
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Page 19 - I often say that if you can measure that of which you speak, and can express it by a number, you know something of your subject ; but if you cannot measure it, your knowledge is meagre and unsatisfactory.