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Home > Category Index for Science Quotations > Category Index R > Category: Repulsion

Repulsion Quotes (4 quotes)

Force, then, is Force, but mark you! Not a thing,
Only a Vector;
Thy barbθd arrows now have lost their sting,
Impotent spectre!
Thy reign, O force! is over. Now no more
Heed we thine action;
Repulsion leaves us where we were before,
So does attraction.
Both Action and Reaction now are gone.
Just ere they vanished,
Stress joined their hands in peace, and made them one;
Then they were banished....
Reproduced in Bruce Clarke, Energy Forms: Allegory and Science in the Era of Classical Thermodynamics (2001), 20-21. In his parody of Shelley's Prometheus Unbound, Maxwell presents Newton's laws of motion updated into axioms of energy.
Science quotes on:  |  Action (151)  |  Arrow (13)  |  Attraction (32)  |  Energy (185)  |  Force (194)  |  Heed (7)  |  Impotence (6)  |  Joining (2)  |  Laws Of Motion (3)  |  Loss (62)  |  Sir Isaac Newton (258)  |  Parody (2)  |  Peace (58)  |  Poem (85)  |  Reaction (59)  |  Reign (5)  |  Spectre (3)  |  Sting (3)  |  Stress (8)  |  Vanishing (8)  |  Vector (3)

In the discussion of the. energies involved in the deformation of nuclei, the concept of surface tension of nuclear matter has been used and its value had been estimated from simple considerations regarding nuclear forces. It must be remembered, however, that the surface tension of a charged droplet is diminished by its charge, and a rough estimate shows that the surface tension of nuclei, decreasing with increasing nuclear charge, may become zero for atomic numbers of the order of 100. It seems therefore possible that the uranium nucleus has only small stability of form, and may, after neutron capture, divide itself into two nuclei of roughly equal size (the precise ratio of sizes depending on liner structural features and perhaps partly on chance). These two nuclei will repel each other and should gain a total kinetic energy of c. 200 Mev., as calculated from nuclear radius and charge. This amount of energy may actually be expected to be available from the difference in packing fraction between uranium and the elements in the middle of the periodic system. The whole 'fission' process can thus be described in an essentially classical way, without having to consider quantum-mechanical 'tunnel effects', which would actually be extremely small, on account of the large masses involved.
[Co-author with Otto Robert Frisch]
Lise Meitner and O. R. Frisch, 'Disintegration of Uranium by Neutrons: a New Type of Nuclear Reaction', Nature (1939), 143, 239.
Science quotes on:  |  Atomic Number (3)  |  Charge (29)  |  Deformation (3)  |  Estimate (19)  |  Fission (7)  |  Kinetic Energy (2)  |  Nucleus (30)  |  Quantum Theory (55)  |  Radius (4)  |  Surface Tension (2)  |  Uranium (16)

The man who proportions the several parts of a mill, uses the same scientific principles [mechanics], as if he had the power of constructing an universe; but as he cannot give to matter that invisible agency, by which all the component parts of the immense machine of the universe have influence upon each other, and set in motional unison together without any apparent contact, and to which man has given the name of attraction, gravitation, and repulsion, he supplies the place of that agency by the humble imitation of teeth and cogs. All the parts of man’s microcosm must visibly touch.
In The Age of Reason: Being an Investigation of True and Fabulous Theology (27 Jan O.S. 1794), 42-43.
Science quotes on:  |  Agency (13)  |  Apparent (26)  |  Attraction (32)  |  Cog (3)  |  Component (14)  |  Constructing (3)  |  Contact (24)  |  Gravitation (27)  |  Humble (23)  |  Imitation (17)  |  Immense (28)  |  Influence (110)  |  Invisible (30)  |  Machine (133)  |  Matter (270)  |  Mechanics (44)  |  Microcosm (6)  |  Mill (5)  |  Motion (127)  |  Part (146)  |  Power (273)  |  Principle (228)  |  Proportion (47)  |  Scientific (169)  |  Teeth (11)  |  Touch (48)  |  Universe (563)  |  Use (70)

Tyndall declared that he saw in Matter the promise and potency of all forms of life, and with his Irish graphic lucidity made a picture of a world of magnetic atoms, each atom with a positive and a negative pole, arranging itself by attraction and repulsion in orderly crystalline structure. Such a picture is dangerously fascinating to thinkers oppressed by the bloody disorders of the living world. Craving for purer subjects of thought, they find in the contemplation of crystals and magnets a happiness more dramatic and less childish than the happiness found by mathematicians in abstract numbers, because they see in the crystals beauty and movement without the corrupting appetites of fleshly vitality.
In Back to Methuselah: A Metabiological Pentateuch (1921), lxi-lxii.
Science quotes on:  |  Atom (251)  |  Attraction (32)  |  Beauty (171)  |  Crystal (47)  |  Magnetism (26)  |  Matter (270)  |  Negative (24)  |  Pole (14)  |  Positive (28)  |  Structure (191)  |  John Tyndall (46)


Carl Sagan Thumbnail In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion. (1987) -- Carl Sagan
Quotations by: • Albert Einstein • Isaac Newton • Lord Kelvin • Charles Darwin • Srinivasa Ramanujan • Carl Sagan • Florence Nightingale • Thomas Edison • Aristotle • Marie Curie • Benjamin Franklin • Winston Churchill • Galileo Galilei • Sigmund Freud • Robert Bunsen • Louis Pasteur • Theodore Roosevelt • Abraham Lincoln • Ronald Reagan • Leonardo DaVinci • Michio Kaku • Karl Popper • Johann Goethe • Robert Oppenheimer • Charles Kettering  ... (more people)

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