2007-07-20 06:16:25 · 12 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
as Jlynes said...
the reistance is the main thing.. its the same with anything.. heat makes things expand.. a wooden door is a good example.
your pc / mac has a big heatsink on the top to draw the heat away from the chip , as it has a certain tempreture boundary where it works effectivly.
2007-07-20 06:25:17 · answer #1 · answered by junglejungle 7 · 0⤊ 0⤋
Super Conductors require incredible cold to slow down molecular vibrations sufficiently to facilitate unimpeded electron flow in accordance with what is known as BCS theory. The BCS theory suggests that electrons team up in "Cooper pairs" in order to help each other overcome molecular obstacles - much like race cars on a track drafting each other in order to go faster. Scientists call this process phonon-mediated coupling because of the sound packets generated by the flexing of the crystal lattice.
2007-07-20 13:35:08 · answer #2 · answered by Marty o 1 · 0⤊ 0⤋
Basically:
(1) what we call "heat" is just a measure of how agitated the atoms / molecules of a substance, are. The higher the temperature, the more the constituting elements oscillate (minuscule oscillations, obviously). At the other extreme, at the absolute zero, there are no vibrations left at all.
(2) these vibrations tend to hamper the circulation of electrons. Try to think of yourself trying to run through a group of people, well aligned in rows and columns. If they don't move at all, you'll be able to run fast w/o bumping into anyone. But if they start moving around their set position, you'll either collide from time to time (that's what an electron would do), or you would slow down and be more careful (electrons can't do that).
Hope it helps
2007-07-20 13:32:09 · answer #3 · answered by AntoineBachmann 5 · 0⤊ 0⤋
If the conductor is extremely cold the atome are almost stationary and hence give little resistance to the movement of electrons.
If you try to cross a busy road something might hit you. When the traffic stops it becomes easy.
2007-07-23 07:25:17 · answer #4 · answered by lykovetos 5 · 0⤊ 0⤋
http://www.opamp-electronics.com/tutorials/superconductivity_1_12_07.htm
There is some debate over exactly how and why superconducting materials superconduct. One theory holds that electrons group together and travel in pairs (called Cooper pairs) within a superconductor rather than travel independently, and that has something to do with their frictionless flow. Interestingly enough, another phenomenon of super-cold temperatures, superfluidity, happens with certain liquids (especially liquid helium), resulting in frictionless flow of molecules.
Go to the link provided and what a great question! I just looked it up and am giving you the source of the material.
2007-07-20 13:36:24 · answer #5 · answered by martybop 3 · 0⤊ 0⤋
At low temperatures the electrons form cooper pairs. These pairs act in such a way so that they travel with no resistance through the material. This is a different state, it has nothing to do with the resistivity or its dependence on temperature.
2007-07-20 13:28:53 · answer #6 · answered by anime_insomnia 1 · 1⤊ 0⤋
Low temperatures lower a substance's resistivity.
2007-07-20 13:19:11 · answer #7 · answered by JLynes 5 · 2⤊ 0⤋
I have to say that most of the answers here are either wrong or are cut and paste jobs.
anime_insomnia has the best answer and if you need to know more then Google cooper pairs.
2007-07-20 16:56:55 · answer #8 · answered by Anonymous · 0⤊ 0⤋
Resistance falls with temperature.
2007-07-20 13:25:22 · answer #9 · answered by ag_iitkgp 7 · 0⤊ 0⤋
I suppose that the colder the substance, the closer the molecules are, making conductivity possible.
2007-07-20 13:26:49 · answer #10 · answered by blowfuse 1 · 0⤊ 0⤋