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Home > Category Index for Science Quotations > Category Index T > Category: Thermal

Thermal Quotes (6 quotes)

A new era of ocean exploration can yield discoveries that will help inform everything from critical medical advances to sustainable forms of energy. Consider that AZT, an early treatment for HIV, is derived from a Caribbean reef sponge, or that a great deal of energy—from offshore wind, to OTEC (ocean thermal energy conservation), to wind and wave energy—is yet untapped in our oceans.
In 'Why Exploring the Ocean is Mankind’s Next Giant Leap', contributed to CNN 'Lightyears Blog' (13 Mar 2012).
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A perfect thermo-dynamic engine is such that, whatever amount of mechanical effect it can derive from a certain thermal agency; if an equal amount be spent in working it backwards, an equal reverse thermal effect will be produced.
'Thomson on Carnot’s Motive Power of Heat' (appended to 'R้flexions sur la puissance motrice du feu' (1824) translated by R.H. Thurston) in Reflections on the Motive Power of Fire, and on Machines Fitted to Develop that Power (1890), 139.
Science quotes on:  |  Agency (13)  |  Backwards (3)  |  Certain (84)  |  Deriving (2)  |  Effect (133)  |  Engine (25)  |  Perfect (46)  |  Production (105)  |  Reverse (14)  |  Thermodynamics (27)  |  Work (457)

In despair, I offer your readers their choice of the following definitions of entropy. My authorities are such books and journals as I have by me at the moment.
(a) Entropy is that portion of the intrinsic energy of a system which cannot be converted into work by even a perfect heat engine.—Clausius.
(b) Entropy is that portion of the intrinsic energy which can be converted into work by a perfect engine.—Maxwell, following Tait.
(c) Entropy is that portion of the intrinsic energy which is not converted into work by our imperfect engines.—Swinburne.
(d) Entropy (in a volume of gas) is that which remains constant when heat neither enters nor leaves the gas.—W. Robinson.
(e) Entropy may be called the ‘thermal weight’, temperature being called the ‘thermal height.’—Ibid.
(f) Entropy is one of the factors of heat, temperature being the other.—Engineering.
I set up these bald statement as so many Aunt Sallys, for any one to shy at.
[Lamenting a list of confused interpretations of the meaning of entropy, being hotly debated in journals at the time.]
In The Electrician (9 Jan 1903).
Science quotes on:  |  Rudolf Clausius (8)  |  Constant (40)  |  Converted (2)  |  Definition (152)  |  Despair (25)  |  Energy (185)  |  Engineering (115)  |  Enter (20)  |  Entropy (40)  |  Factor (34)  |  Heat Engine (4)  |  Height (24)  |  Imperfect (10)  |  Intrinsic (10)  |  Leave (63)  |  James Clerk Maxwell (75)  |  Perfect (46)  |  Remain (77)  |  Shy (3)  |  System (141)  |  Peter Guthrie Tait (6)  |  Temperature (42)  |  Weight (61)  |  Work (457)

Teaching thermal physics
Is as easy as a song:
You think you make it simpler
When you make it slightly wrong!
In The Physics Teacher (Sep 1970). As quoted and cited in Clifford Swartz, Cliff's Nodes: Editorials from The Physics Teacher (2006), 192.
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The thermal agency by which mechanical effect may be obtained is the transference of heat from one body to another at a lower temperature.
'R้flexions sur la puissance motrice du feu' (1824) translated by R.H. Thurston in Reflections on the Motive Power of Fire, and on Machines Fitted to Develop that Power (1890), 139.
Science quotes on:  |  Agency (13)  |  Effect (133)  |  Heat (90)  |  Mechanics (44)  |  Temperature (42)  |  Transfer (8)

[The nanotube] brings those properties you cannot get from other organic molecules. And it’s still carbon, so it has organic chemistry. Here is an object that has, to a superlative degree, the aspects that we hold most central to the inorganic world: hardness, toughness, terrific strength, thermal and electrical conductivity. Things you just can’t do with bone and wood. But it’s made out of carbon. It's something that plays the game at the same level of perfection as molecules and life.
From interview in 'Wires of Wonder', Technology Review (Mar 2001), 104, No. 2, 88.
Science quotes on:  |  Bone (57)  |  Carbon (48)  |  Chemistry (239)  |  Conductivity (3)  |  Electricity (121)  |  Hardness (3)  |  Inorganic (11)  |  Life (917)  |  Molecule (125)  |  Organic (48)  |  Perfection (71)  |  Property (96)  |  Strength (63)  |  Wood (33)


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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- 90 -
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- 70 -
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