The whole science of heat is founded Thermometry and Calorimetry, and when these operations are understood we may proceed to the third step, which is the investigation of those relations between the thermal and the mechanical properties of substances which form the subject of Thermodynamics. The whole of this part of the subject depends on the consideration of the Intrinsic Energy of a system of bodies, as depending on the temperature and physical state, as well as the form, motion, and relative position of these bodies. Of this energy, however, only a part is available for the purpose of producing mechanical work, and though the energy itself is indestructible, the available part is liable to diminution by the action of certain natural processes, such as conduction and radiation of heat, friction, and viscosity. These processes, by which energy is rendered unavailable as a source of work, are classed together under the name of the Dissipation of Energy.
James Clerk MaxwellRelated topics
action certain diminution dissipation form heat intrinsic name natural position proceed purpose radiation science source state step temperature thermal thermodynamics third under well work relations unavailable operationsRelated quotes
The ancients considered mechanics in a twofold respect; as rational, which proceeds accurately by demonstration, and practical. To practical mechanics all the manual arts belong, from which mechanics took its name. But as artificers do not work with perfect accuracy, it comes to pass that mechanics is so distinguished from geometry, that what is perfectly accurate is called geometrical; what is less so is called mechanical. But the errors are not in the art, but in the artificers. He that works with less accuracy is an imperfect mechanic: and if any could work with perfect accuracy, he would be the most perfect mechanic of all; for the description of right lines and circles, upon which geometry is founded, belongs to mechanics. Geometry does not teach us to draw these lines, but requires them to be drawn; for it requires that the learner should first be taught to describe these accurately, before he enters upon geometry; then it shows how by these operations problems may be solved.
Isaac Newton
Not only was he ignorant, but he had not even those conditions within himself which made knowledge possible. All that there was developed of him, at present, was a fund of energy, self-esteem, hope, courage, and daring, the love of action, life, and adventure; his life was in the outward and present, not in the inward and reflective; he was a true ten-year old boy, in its healthiest and most animal perfection. What she was, the small pearl with the golden hair, with her frail and high-strung organization, her sensitive nerves, her half-spiritual fibres, her ponderings, and marvels, and dreams, her power of love, and yearning for self-devotion, our readers may, perhaps, have seen. But if ever two children, or two grown people, thus organized, are thrown into intimate relations, it follows, from the very laws of their being, that one must hurt the other, simply by being itself; one must always hunger for what the other has not to give.
Harriet Beecher Stowe
While I have not lost faith in its potentialities, my views have changed since. War can not be avoided until the physical cause for its recurrence is removed and this, in the last analysis, is the vast extent of the planet on which we live. Only though annihilation of distance in every respect, as the conveyance of intelligence, transport of passengers and supplies and transmission of energy will conditions be brought about some day, insuring permanency of friendly relations. What we now want most is closer contact and better understanding between individuals and communities all over the earth and the elimination of that fanatic devotion to exalted ideals of national egoism and pride, which is always prone to plunge the world into primeval barbarism and strife. No league or parliamentary act of any kind will ever prevent such a calamity. These are only new devices for putting the weak at the mercy of the strong.
Nikola Tesla
It is the refutation alike of communism and socialism that they thwart the instinct of expansion; that they substitute for individual energy the energy of the government; that they substitute for human personality the blind, mechanical power of the State. The one system, as the other, marks the end of individualism. The one system, as the other, would make each man the image of his neighbor. The one system, as the other, would hold back the progressive, and, by uniformity of reward, gain uniformity of type.
I can look forward to no blissful prospect for a race of men that, under the dominion of the State, at the cost of all freedom of action, at the cost, indeed, of their own true selves, shall enjoy, if one will, a fair abundance of the material blessings of life. ... Into that prison of socialism, with broken enterprise and broken energy, as serfs under the mastery of the State, while human personality is preferred to unreasoning mechanism, mankind must hesitate to step.
Benjamin N. Cardozo
We must be careful to discriminate between our own incapacity to test truth and the necessary improbability of an event. It is plain that from our ignorance of the remote spheres of God's action we cannot judge of His works removed from our experience; but a fact is not necessarily doubtful because it cannot be reached by our ordinary senses. To recapitulate, we may lay down the following propositions:
1. That there is no real physical distinction between miracles and any other operations of the Divine energy : that we regard them differently is because we are familiar with one order of events and not the other.
2. There is nothing incredible in a miracle, and the credibility of a miraculous event is to be measured only by the evidence which sustains it. And although the extraordinary character of a phenomenon may render the event itself improbable, it does not, therefore, necessarily render it either incredible or untrue.
Charles Babbage