What is the fifth state of matter?
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In 1924, Albert Einstein and Satyendra Nath Bose predicted the "Bose-Einstein condensate" (BEC), which is referred as the fifth state of matter.
A Bose-Einstein condensate (BEC) is a state of matter of a dilute gas of bosons cooled to temperatures very close to absolute zero (that is, very near 0 K or ?273.14 C). Under such conditions, a large fraction of bosons occupy the lowest quantum state, at which point macroscopic quantum phenomena become apparent.