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<p>suffices to call a substance "plasma" depends on the specific phenomenon being considered.</p>

<p><big>Etymology</big></p>
<p>As part of his systematic studies, <a href="page.php?w=Irving_Langmuir">Irving Langmuir</a> introduced the term plasma as a description of ionized gas in 1928: </p>

<p><a href="page.php?w=Lewi_Tonks">Lewi Tonks</a> and Harold Mott-Smith, both of whom worked with Langmuir in the 1920s, recall that Langmuir first used the term by analogy with the <a href="page.php?w=blood_plasma">blood plasma</a>. Mott-Smith recalls, in particular,</p><p>
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