Why are superconductors referred as Macroscopic Quantum phenomena?

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  • Most quantum phenomena – like the fact that light can behave as either a particle or a wave – is only observable on a very small scale, so would be referred to as “microscopic” (though it’s much smaller than you’d see with a microscope!).

    Superconductors are only understandable using quantum theory – the electrons pair up in a superconductor in a way that would not be possible in classical physics.

    http://science.howstuffworks.com/environ…

    Superconductors can be made to work in the lab with sizes as large as you like – certainly you could make one you could fit in your hand (though it’d probably be too cold to actually do that with). Given that they can be made that big, they are considered ‘macroscopic’ objects.

    Putting all that together, you can refer to superconductors as macroscopic quantum phenomena.

    Hope that makes sense.
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