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James Prescott Joule
(24 Dec 1818 - 11 Oct 1889)
English physicist.
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Science Quotes by James Prescott Joule (3 quotes)
The animal frame, though destined to fulfill so many other ends, is as a machine more perfect than the best contrived steam-engine—that is, is capable of more work with the same expenditure of fuel.
— James Prescott Joule
'On Matter, Living Force, and Heat' (1847). In The Scientific Papers of James Prescott Joule (1884), Vol. 1, 271.
The earth in its rapid motion round the sun possesses a degree of living force so vast that, if turned into the equivalent of heat, its temperature would be rendered at least one thousand times greater than that of red-hot iron, and the globe on which we tread would in all probability be rendered equal in brightness to the sun itself.
— James Prescott Joule
'On Matter, Living Force, and Heat' (1847). In The Scientific Papers of James Prescott Joule (1884), Vol. 1, 271.
The most convincing proof of the conversion of heat into living force [vis viva] has been derived from my experiments with the electro-magnetic engine, a machine composed of magnets and bars of iron set in motion by an electrical battery. I have proved by actual experiment that, in exact proportion to the force with which this machine works, heat is abstracted from the electrical battery. You see, therefore, that living force may be converted into heat, and that heat may be converted into living force, or its equivalent attraction through space.
— James Prescott Joule
'On Matter, Living Force, and Heat' (1847). In The Scientific Papers of James Prescott Joule (1884), Vol. 1, 270-1.
Quotes by others about James Prescott Joule (2)
You'll be thought cool
If you call it the joule.
But there'll be a howl
If you call it the jowl.
If you call it the joule.
But there'll be a howl
If you call it the jowl.
Supplied to Oxford Dictionary of Quotations by W. H. Brock.
In the vestibule of the Manchester Town Hall are placed two life-sized marble statues facing each other. One of these is that of John Dalton ... the other that of James Prescott Joule. ... Thus the honour is done to Manchester's two greatest sons—to Dalton, the founder of modern Chemistry and of the atomic theory, and the laws of chemical-combining proportions; to Joule, the founder of modern physics and the discoverer of the Law of Conservation of Energy.
One gave to the world the final proof ... that in every kind of chemical change no loss of matter occurs; the other proved that in all the varied modes of physical change, no loss of energy takes place.
One gave to the world the final proof ... that in every kind of chemical change no loss of matter occurs; the other proved that in all the varied modes of physical change, no loss of energy takes place.
John Dalton and the Rise of Modern Chemistry (1895), 7.
See also:
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24 Dec - short biography, births, deaths and events on date of Joule's birth.
At the heart of science is an essential balance between two seemingly contradictory attitudes--an openness to new ideas, no matter how bizarre or counterintuitive they may be, and the most ruthless skeptical scrutiny of all ideas, old and new. This is how deep truths are winnowed from deep nonsense. -- Carl Sagan
