The property of being repelled by magnetic fields, present to some degree in all materials but most noticeable in diamagnetic substances.
From diamagnet + -ism suffix. Michael Faraday discovered this phenomenon in the 1840s, revolutionizing understanding of magnetism beyond simple attraction.
Diamagnetism is actually a fundamental quantum mechanical effect—electrons orbiting atoms create tiny magnetic fields that actively oppose external magnets, making it one of nature's simplest yet most elegant demonstrations of quantum physics.
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