HeatMacmillan, 1892 - 372 pàgines |
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Frases i termes més freqüents
absolute temperature absorption adiabatic amount of heat atmosphere black body boiling boiling-point bulb carbonic acid Carnot's circuit coefficient cold colder compression condensation conductivity constant convection cooling copper corresponding cylinder definite density diagram dilatation direction electric employed energy equal expansion experiment experimental fact farther galvanometer gases give given glass Hence hot body hydrogen inclosure increase indicator diagram iron isothermal Joule junctions kinetic latent heat liquid lower mass measured melting melting-point mercury metal method mixture molecular motion P. G. TAIT particles passing Peltier effect perature plate pound pressure produced quantity of heat raised range of temperature ratio rays Regnault rise of temperature scale solid specific heat steam substance suppose surface tempera theory thermal thermal capacity thermal conductivity thermo-electric thermometer Thomson Thomson effect tion tube ture units of heat vapour vessel volume wave-length whole wire
Passatges populars
Pàgina 25 - 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.
Pàgina 370 - But if we conceive a being whose faculties are so sharpened that he can follow every molecule in its course...
Pàgina 370 - Now let us suppose that such a vessel is divided into two portions, A and B, by a division in which there is a small hole, and that a being, who can see the individual molecules, opens and closes this hole, so as to allow only the swifter molecules to pass from A to B, and only the slower ones to pass from B to A. He will thus, without expenditure of work, raise the temperature of B and lower that of A, in contradiction to the second law of thermodynamics.
Pàgina 13 - To every action there is always an equal and contrary reaction ; or the mutual actions of any two bodies are always equal and oppositely directed.
Pàgina 59 - If an engine be such that, when it is worked backwards, the physical and mechanical agencies in every part of its motions are all reversed, it produces as much mechanical effect as can be produced by any thermodynamic engine, with the same temperatures of source and refrigerator, from a given quantity of heat.
Pàgina 25 - And, in reasoning on this subject, we must not forget to consider that most remarkable circumstance, that the source of the Heat generated by friction, in these experiments, appeared evidently to be inexhaustible. 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...
Pàgina 27 - From this experiment it is evident that ice by friction is converted into water, and according to the supposition, its capacity is diminished ; but it is a well-known fact, that the capacity of water for heat is much greater than that of ice ; and ice must have an absolute quantity of heat added to it, before it can be converted into water. Friction consequently does not diminish the capacities of bodies for heat.
Pàgina 240 - Is not the heat of the warm room conveyed through the vacuum by the vibrations of a much subtiler medium than air...
Pàgina 14 - If the activity of an agent be measured by the product of its force into its velocity ; and if, similarly, the counter-activity of the resistance be measured by the velocities of its several parts into their several forces, whether these arise from friction, cohesion, weight, or acceleration ; — activity and counter-activity, in all combinations of machines, will be equal and opposite...
Pàgina 30 - When equal quantities of mechanical effect are produced by any means whatever from purely thermal sources, or lost in purely thermal effects, equal quantities of heat are put out of existence or are generated.