The Scientific Papers of James Prescott Joule, Volume 1

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Taylor & Francis, 1884 - 657 pages
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Page 301 - It is hardly necessary to add that anything which any insulated body, or system of bodies, can continue to furnish without limitation, cannot possibly be a material substance; and it appears to me to be extremely difficult, if not quite impossible, to form any distinct idea of anything capable of being excited and communicated in the manner the Heat was excited and communicated in these experiments, except it be MOTION.
Page 295 - It seems possible to account for all the phenomena of heat, if it be supposed that in solids the particles are in a constant state of vibratory motion, the particles of the hottest bodies moving with the greatest velocity...
Page 184 - ... no change of temperature occurs when air is allowed to expand in such a manner as not to develop mechanical power.
Page 158 - Physiology*,' he had not pursued the subject further. It is unquestionable that heat is produced by such friction, but it must be understood that the mechanical force expended in the friction is a part of the force of affinity which causes the venous blood to unite with oxygen ; so that the whole heat of the system must still be referred to the chemical changes. But if the animal were engaged in turning a piece of machinery, or in ascending a mountain, I apprehend that in proportion to the muscular...
Page 120 - The magnetic electrical machine enables us to convert mechanical power into heat by means of the electric currents which are induced by it ; and I have little doubt that, by interposing an electromagnetic engine in the circuit of a battery, a diminution of the heat evolved per equivalent of chemical change would be the consequence, and this in proportion to the mechanical...
Page 336 - ... the ratio of the specific heat of air at constant pressure to the specific heat at constant volume.
Page 299 - Heat is a very brisk agitation of the insensible parts of the object, which produces in us that sensation, from whence we denominate the object hot ; so what in our sensation is heat, in the object is nothing but motion.
Page 156 - That the quantity of heat produced by the friction of bodies, whether solid or liquid, is always proportional to the quantity of force extended.
Page 335 - W . where y is the ratio of the specific heat of air at constant pressure to that at constant volume.
Page 297 - ... grs. Therefore, since it is manifest that the pressure will be proportional to the square of the velocity of the particles, we shall have for the velocity of the particles requisite to produce the pressure of 14,831,712 grs.

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