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We define thermodynamics ... as the investigation of the dynamical and thermal properties of bodies, deduced entirely from the first and second law of thermodynamics, without speculation as to the molecular constitution.

James Clerk Maxwell

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James Clerk Maxwell
Age: 48 †
Born: 1831
Born: June 13
Died: 1879
Died: November 5
Engineer
Inventor
Mathematician
Photographer
Physicist
Teacher
Theoretical Physicist
University Teacher
Edinburgh
Scotland
Maxwell
Without
Entirely
Thermal
First
Bodies
Deduced
Property
Thermodynamics
Constitution
Molecular
Second
Properties
Law
Speculation
Body
Investigation
Firsts
Define
Dynamical

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Heat may be generated and destroyed by certain processes, and this shows that heat is not a substance.
James Clerk Maxwell
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Francis Galton, whose mission it seems to be to ride other men's hobbies to death, has invented the felicitous expression 'structureless germs'.
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At quite uncertain times and places, The atoms left their heavenly path, And by fortuitous embraces, Engendered all that being hath. And though they seem to cling together, And form 'associations' here, Yet, soon or late, they burst their tether, And through the depths of space career.
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The only laws of matter are those that our minds must fabricate and the only laws of mind are fabricated for it by matter.
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The equations at which we arrive must be such that a person of any nation, by substituting the numerical values of the quantities as measured by his own national units, would obtain a true result.
James Clerk Maxwell
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Very few of us can now place ourselves in the mental condition in which even such philosophers as the great Descartes were involved in the days before Newton had announced the true laws of the motion of bodies.
James Clerk Maxwell
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The University of Cambridge, in accordance with that law of its evolution, by which, while maintaining the strictest continuity between the successive phases of its history, it adapts itself with more or less promptness to the requirements of the times, has lately instituted a course of Experimental Physics.
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The 2nd law of thermodynamics has the same degree of truth as the statement that if you throw a tumblerful of water into the sea, you cannot get the same tumblerful of water out again.
James Clerk Maxwell
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We can scarcely avoid the inference that light consists in the transverse undulations of the same medium which is the cause of electric and magnetic phenomena.
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Thus number may be said to rule the whole world of quantity, and the four rules of arithmetic may be regarded as the complete equipment of the mathematician.
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All the mathematical sciences are founded on relations between physical laws and laws of numbers, so that the aim of exact science is to reduce the problems of nature to the determination of quantities by operations with numbers.
James Clerk Maxwell
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Gin a body meet a body Flyin' through the air, Gin a body hit a body, Will it fly? and where?
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In your letter you apply the word imponderable to a molecule. Don't do that again. It may also be worth knowing that the aether cannot be molecular. If it were, it would be a gas, and a pint of it would have the same properties as regards heat, etc., as a pint of air, except that it would not be so heavy.
James Clerk Maxwell
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Mathematicians may flatter themselves that they possess new ideas which mere human language is as yet unable to express.
James Clerk Maxwell
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The mathematical difficulties of the theory of rotation arise chiefly from the want of geometrical illustrations and sensible images, by which we might fix the results of analysis in our minds.
James Clerk Maxwell
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Thoroughly conscious ignorance is the prelude to every real advance in science.
James Clerk Maxwell
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I have the capacity of being more wicked than any example that man could set me.
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Colour as perceived by us is a function of three independent variables at least three are I think sufficient, but time will show if I thrive.
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The chief philosophical value of physics is that it gives the mind something distinct to lay hold of, which, if you don't, Nature at once tells you you are wrong.
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The vast interplanetary and vast interstellar regions will no longer be regarded as waste places in the universe. We shall find them to be already full of this wonderful medium so full that no human power can remove it from the smallest portion of space or produce the slightest flaw in its infinite continuity.
James Clerk Maxwell