The New Physics and Its Evolution |
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according action activity admit allow already appear atom becomes bodies cathode certain charge chemical complete conductivity consequences considerable considered constitution contain contrary determined direction discovered discovery doubt Edition effected electric electrons enabled energy equal established ether evidently evolution examine exist experiments fact field follow force gases give given hand heat hypothesis idea important interesting ions known laws less light liquid magnetic mass material matter means measure mechanics medium metals method molecules movement nature negative observed obtained ordinary particles particular pass phenomena phenomenon physicists physics positive possible precision present pressure principle produced Professor properties quantity question radiations radioactive radium rays recent regard relation remain remarkable researches seems simple solid solution speed substances succeeded suppose temperature theory tion transformations tube unit variations various vibrations waves
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Página 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.