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Nanoparticle vs Undefined - What's the difference?

nanoparticle | undefined |

As a noun nanoparticle

is any microscopic particle less than about 100 nanometers (nm) in diameter in aerosol science, the term is often reserved for particles less than 50 nm in diameter; the term "ultrafine particles" is used for particles less than 100 nm in diameter.

As an adjective undefined is

lacking a definition or value.

nanoparticle

English

Noun

(wikipedia nanoparticle) (en noun)
  • any microscopic particle less than about 100 nanometers (nm) in diameter. In aerosol science, the term is often reserved for particles less than 50 nm in diameter; the term "ultrafine particles" is used for particles less than 100 nm in diameter.

    • See also

    *nanotechnology *quantum dot *ultrafine particle

    undefined

    English

    Adjective

    (wikipedia undefined) (-)
  • Lacking a definition or value.
  • (mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.
    • The result of division by zero is undefined .

    Antonyms

    * defined