Change of Internal State of An Isolated System
If an isolated system is left long enough, it will reach a state of thermal equilibrium, in which its temperature will be uniform throughout, but not necessarily a state of thermodynamic equilibrium, if there is some structural barrier that can prevent some possible processes in the system from reaching equilibrium. An isolated system can change its temperature or its spatial distribution of temperature by changing the state of Longley, R.G. Van Name, Longmans, Green & Co., New York, 1928, volume 1, pages 55-353, particularly pages 144-150. A system prepared as a mixture of petrol vapour and air can be ignited by a spark and produce carbon dioxide and water; if this happens in an isolated system, it will increase the temperature of the system, and during the increase, the system is not in thermal equilibrium; but eventually the system will settle to a uniform temperature. In a system prepared as a block of ice floating in a bath of hot water, and then isolated, the ice can melt; during the melting, the system is not in thermal equilibrium; but eventually its temperature will become uniform. Such changes in isolated systems are irreversible in the sense that while such a change will occur spontanteously whenever the system is prepared in the same way, the reverse change will never occur spontanteously within the isolated system; this is a large part of the content of the second law of thermodynamics. Truly isolated systems hardly occur in nature, and nearly always are artificially prepared.
Read more about this topic: Thermal Equilibrium
Famous quotes containing the words change of, change, internal, state, isolated and/or system:
“A life-worshipper’s philosophy is comprehensive.... He is at one moment a positivist and at another a mystic: now haunted by the thought of death ... and now a Dionysian child of nature; now a pessimist and now, with a change of lover or liver or even the weather, an exuberant believer that God’s in his heaven and all’s right with the world.”
—Aldous Huxley (1894–1963)
“[The boss] asked me if I was not interested in a change in my life. I answered that one can never change lives, that in any case all lives were the same, and that I was not at all unhappy with mine.”
—Albert Camus (1913–1960)
“If the Revolution has the right to destroy bridges and art monuments whenever necessary, it will stop still less from laying its hand on any tendency in art which, no matter how great its achievement in form, threatens to disintegrate the revolutionary environment or to arouse the internal forces of the Revolution, that is, the proletariat, the peasantry and the intelligentsia, to a hostile opposition to one another. Our standard is, clearly, political, imperative and intolerant.”
—Leon Trotsky (1879–1940)
“No state can build
A literature that shall at once be sound
And sad on a foundation of well-being.”
—Robert Frost (1874–1963)
“An isolated outbreak of virginity ... is a rash on the face of society. It arouses only pity from the married, and embarrassment from the single.”
—Charlotte Bingham (b. 1942)
“... the yearly expenses of the existing religious system ... exceed in these United States twenty millions of dollars. Twenty millions! For teaching what? Things unseen and causes unknown!... Twenty millions would more than suffice to make us wise; and alas! do they not more than suffice to make us foolish?”
—Frances Wright (1795–1852)