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YDS PARAGRAF DOLDURMA / TEST 6 27. Soru

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27.

- When certain metals such as lead or
mercury are cooled to temperatures very
near absolute zero, they exhibit
phenomenon known as superconductivity.--
-- In addition, they may also the used to
build trains that float above their tracks on
magnetic fields, allowing them to travel at a
very high speed because of the reduced
friction.

Until recently, the highest temperature at
which any known superconductor would
operate was around 22 degrees centigrade

Such superconductors must be cooled by
immersing them in liquid helium

These superconductors may be used to
build super-fast computers

Unfortunately, they are expensive and in
fairly short supply

So jar they have not been able to carry as
much current as others