What are some superconductors that can be easily found in the average store?

Question

Can you please list some and what stores they can be found in? Thank-you.

Answer 1

Helium,
Oh and it can't be any helium it has to be a very rare isotope Helium 3

Of course you have to chill it to near absolute zero (1.8 K, which is colder than deep space) and create Helium II, but that is a minor complication.

The only other superconductors we know of are superconductive up to 90 degrees K and are made of exotic clays and rare earth materials that you can't find very easily anywhere.

Normally, liquid helium is used to chill other superconducting materials like the core of an MRI machine. The effects of Helium II are theoritical since we can't make it or get any of it.

According to Wikipedia: http://en.wikipedia.org/wiki/Superconductor
"In 1986 the discovery of a family of cuprate-perovskite ceramic materials known as high-temperature superconductors, with critical temperatures in excess of 90 kelvin, spurred renewed interest and research in superconductivity for several reasons. As a topic of pure research, these materials represented a new phenomenon not explained by the current theory. And, because the superconducting state persists up to more manageable temperatures (past the economically-important boiling point of liquid nitrogen), more commercial applications are feasible, especially if materials with even higher critical temperatures could be discovered."

According to Wikipedia: http://en.wikipedia.org/wiki/Helium-3
"³He is a primordial substance in the Earth's mantle, considered to have become entrapped within the Earth during planetary formation. The ratio of ³He to 4He within the Earth's crust and mantle is less than that for assumptions of solar disk composition as obtained from meteorite and lunar samples, with terrestrial materials generally containing lower ³He/4He ratios due to ingrowth of 4He from radioactive decay.

³He is present within the mantle, in the ratio of 200-300 parts of ³He to a million parts of 4He. Ratios of ³He/4He in excess of atmospheric are indicative of a contribution of ³He from the mantle. Crustal sources are dominated by the 4He which is produced by the decay of radioactive elements in the crust and mantle.

³He is also present in the Earth's atmosphere. The natural abundance of ³He in naturally occurring helium gas is 1.38×10-6. The partial pressure of helium in the Earth's atmosphere is about 4 millitorr, and thus 5.2 parts per million of helium. It has been proven that the Earth's atmosphere contains approximately 4000 tons of ³He."

According to Wikipedia: http://en.wikipedia.org/wiki/Helium
"The thermal conductivity of helium II is greater than that of any other known substance, a million times that of helium I and several hundred times that of copper. This is because heat conduction occurs by an exceptional quantum-mechanical mechanism. Most materials that conduct heat well have a valence band of free electrons which serve to transfer the heat. Helium II has no such valence band but nevertheless conducts heat well. The flow of heat is governed by equations that are similar to the wave equation used to characterize sound propagation in air. So when heat is introduced, it will move at 20 meters per second at 1.8 K through helium II as waves in a phenomenon called second sound."

Answer 2

Superconductivity only arises in the right materials, at extremely low temperatures. So you can can see it in physics labs or in specialized equipment, but not in an average store.

Answer 3

Perhaps YOU should do your homework. Then you won't be stupid and work for minimum wage all your life.