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Home > Dictionary of Science Quotations > Scientist Names Index J > James Prescott Joule Quotes

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James Prescott Joule
(24 Dec 1818 - 11 Oct 1889)

English physicist.


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.
Science quotes on:  |  Animal (143)  |  Fuel (16)  |  Machine (56)  |  Steam Engine (21)  |  Work (198)

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.
Science quotes on:  |  Earth (250)  |  Heat (48)  |  Orbit (36)  |  Sun (115)  |  Temperature (23)

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.
Science quotes on:  |  Battery (3)  |  Conservation Of Energy (17)  |  Electricity (82)  |  Electromagnetism (14)  |  Heat (48)  |  Life (460)  |  Magnet (4)



Quotes by others about James Prescott Joule (4)

You'll be thought cool
If you call it the joule.
But there'll be a howl
If you call it the jowl.
Anonymous
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.
John Dalton and the Rise of Modern Chemistry (1895), 7.
Science quotes on:  |  Atomic Theory (11)  |  Chemical Change (4)  |  Chemistry (143)  |  Combination (37)  |  Conservation Of Energy (17)  |  Conservation Of Mass (2)  |  John Dalton (20)  |  Founder (8)  |  Honour (20)  |  Law (273)  |  Loss (44)  |  Manchester (3)  |  Marble (5)  |  Matter (135)  |  Modern (44)  |  Physical Change (4)  |  Physics (156)  |  Proof (136)  |  Statue (5)  |  Town Hall (2)

In the firmament of science Mayer and Joule constitute a double star, the light of each being in a certain sense complementary to that of the other.
In Heat: A Mode of Motion (1800, 1915), 569.
Science quotes on:  |  Complementary (4)  |  Constitute (5)  |  Firmament (6)  |  Light (117)  |  Robert Mayer (9)  |  Science (875)

Those who are unacquainted with the details of scientific investigation have no idea of the amount of labour expended in the determination of those numbers on which important calculations or inferences depend. They have no idea of the patience shown by a Berzelius in determining atomic weights; by a Regnault in determining coefficients of expansion; or by a Joule in determining the mechanical equivalent of heat.
In Sound: A Course of Eight Lectures Delivered at the Royal Institution of Great Britain (1867), 26.
Science quotes on:  |  Atomic Weight (5)  |  Jφns Jacob Berzelius (11)  |  Calculation (41)  |  Depend (9)  |  Detail (33)  |  Determination (37)  |  Expansion (18)  |  Important (20)  |  Inference (16)  |  Investigation (83)  |  Labor (18)  |  Measurement (112)  |  Number (90)  |  Patience (16)  |  Research (360)  |  Scientific (55)


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  • todayinsci icon 24 Dec - short biography, births, deaths and events on date of Joule's birth.

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
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