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<h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Fluidität</span></h1>
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<div id="mw-content-text" class="mw-body-content mw-content-ltr" lang="de" dir="ltr"><div class="mw-content-ltr mw-parser-output" lang="de" dir="ltr"><table class="wikitable infobox float-right" style="margin-top:0; width:350px;" id="Vorlage_Infobox_Physikalische_Größe" summary="Infobox Physikalische Größe">
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<th colspan="2" style="background:#ABCDEF; color:inherit;"><a href="Physikalische_Gr%C3%B6%C3%9Fe" title="Physikalische Größe">Physikalische Größe</a>
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<td style="width:130px;">Name
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<td><b>Fluidität</b>
</td></tr>
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<td><a href="Formelzeichen" title="Formelzeichen">Formelzeichen</a>
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<td><i><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \phi }">
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<mrow class="MJX-TeXAtom-ORD">
<mstyle displaystyle="true" scriptlevel="0">
<mi>ϕ<!-- ϕ --></mi>
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<annotation encoding="application/x-tex">{\displaystyle \phi }</annotation>
</semantics>
</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/72b1f30316670aee6270a28334bdf4f5072cdde4.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:1.385ex; height:2.509ex;" alt="{\displaystyle \phi }" loading="lazy"></span></i>
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<td colspan="2" style="margin:0; padding:0;">
<table class="wikitable" style="margin:-1px; width:350px;" summary="Einheitensysteme">
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<th><a href="Gr%C3%B6%C3%9Fensystem" title="Größensystem">Größen-</a> und<br><a href="Einheitensystem" title="Einheitensystem">Einheitensystem</a>
</th>
<th><a href="Ma%C3%9Feinheit" title="Maßeinheit">Einheit</a>
</th>
<th><a href="Dimension_(Gr%C3%B6%C3%9Fensystem)" title="Dimension (Größensystem)">Dimension</a>
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<tr>
<td><a href="Internationales_Einheitensystem" title="Internationales Einheitensystem">SI</a>
</td>
<td><a href="Meter" title="Meter">m</a>·<a href="Sekunde" title="Sekunde">s</a>·<a href="Kilogramm" title="Kilogramm">kg</a><sup>−1</sup>=<a href="Meter" title="Meter">m</a><sup>2</sup>·<a href="Newton_(Einheit)" title="Newton (Einheit)">N</a><sup>−1</sup>·<a href="Sekunde" title="Sekunde">s</a><sup>−1</sup>
</td>
<td><a href="L%C3%A4nge_(Physik)" title="Länge (Physik)">L</a>·<a href="Zeit" title="Zeit">T</a>·<a href="Masse_(Physik)" title="Masse (Physik)">M</a><sup>−1</sup>
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<p>Die <b>Fluidität</b> <span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \phi }">
<semantics>
<mrow class="MJX-TeXAtom-ORD">
<mstyle displaystyle="true" scriptlevel="0">
<mi>ϕ<!-- ϕ --></mi>
</mstyle>
</mrow>
<annotation encoding="application/x-tex">{\displaystyle \phi }</annotation>
</semantics>
</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/72b1f30316670aee6270a28334bdf4f5072cdde4.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:1.385ex; height:2.509ex;" alt="{\displaystyle \phi }" loading="lazy"></span> ist ein Maß für die <i>Fließfähigkeit</i> von Flüssigkeiten und Gasen (<a href="Fluid" title="Fluid">Fluiden</a>). Sie ist der <a href="Kehrwert" title="Kehrwert">Kehrwert</a> der <a href="Dynamische_Viskosit%C3%A4t" class="mw-redirect" title="Dynamische Viskosität">dynamischen Viskosität</a> <span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \eta }">
<semantics>
<mrow class="MJX-TeXAtom-ORD">
<mstyle displaystyle="true" scriptlevel="0">
<mi>η<!-- η --></mi>
</mstyle>
</mrow>
<annotation encoding="application/x-tex">{\displaystyle \eta }</annotation>
</semantics>
</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/e4d701857cf5fbec133eebaf94deadf722537f64.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:1.169ex; height:2.176ex;" alt="{\displaystyle \eta }" loading="lazy"></span>:<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
</p>
<dl><dd><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \phi ={\frac {1}{\eta }}}">
<semantics>
<mrow class="MJX-TeXAtom-ORD">
<mstyle displaystyle="true" scriptlevel="0">
<mi>ϕ<!-- ϕ --></mi>
<mo>=</mo>
<mrow class="MJX-TeXAtom-ORD">
<mfrac>
<mn>1</mn>
<mi>η<!-- η --></mi>
</mfrac>
</mrow>
</mstyle>
</mrow>
<annotation encoding="application/x-tex">{\displaystyle \phi ={\frac {1}{\eta }}}</annotation>
</semantics>
</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/e4219a1ef39a15a82cf562791656001d9396dd43.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.338ex; width:6.489ex; height:5.676ex;" alt="{\displaystyle \phi ={\frac {1}{\eta }}}" loading="lazy"></span>.</dd></dl>
<p>Je größer die Fluidität, desto dünnflüssiger (fließfähiger) das Fluid; je geringer die Fluidität, desto dickflüssiger (weniger fließfähig) das Fluid.
</p><p>Die <a href="SI-Einheit" class="mw-redirect" title="SI-Einheit">SI-Einheit</a> der Fluidität ist:
</p>
<dl><dd><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle [\phi ]=\mathrm {\frac {m^{2}}{N\cdot s}} }">
<semantics>
<mrow class="MJX-TeXAtom-ORD">
<mstyle displaystyle="true" scriptlevel="0">
<mo stretchy="false">[</mo>
<mi>ϕ<!-- ϕ --></mi>
<mo stretchy="false">]</mo>
<mo>=</mo>
<mrow class="MJX-TeXAtom-ORD">
<mfrac>
<msup>
<mi mathvariant="normal">m</mi>
<mrow class="MJX-TeXAtom-ORD">
<mn>2</mn>
</mrow>
</msup>
<mrow>
<mi mathvariant="normal">N</mi>
<mo>⋅<!-- ⋅ --></mo>
<mi mathvariant="normal">s</mi>
</mrow>
</mfrac>
</mrow>
</mstyle>
</mrow>
<annotation encoding="application/x-tex">{\displaystyle [\phi ]=\mathrm {\frac {m^{2}}{N\cdot s}} }</annotation>
</semantics>
</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/781236d9ed7ace472775f87c5ba90caa5a1202f4.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.838ex; width:10.952ex; height:5.676ex;" alt="{\displaystyle [\phi ]=\mathrm {\frac {m^{2}}{N\cdot s}} }" loading="lazy"></span></dd></dl>
<p>Eine veraltete <a href="Ma%C3%9Feinheit" title="Maßeinheit">Maßeinheit</a> der Fluidität ist das <a href="Rhe_(Einheit)" title="Rhe (Einheit)">Rhe</a>.
</p>
<div class="mw-heading mw-heading2"><h2 id="Einzelnachweise">Einzelnachweise</h2></div>
<ol class="references">
<li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text"><span class="cite"><a rel="nofollow" class="external text" href="https://www.spektrum.de/lexikon/biologie/fluiditaet/25329"><i>Fluidität.</i></a> In: <i>Lexikon der Biologie.</i> spektrum.de,<span class="Abrufdatum"> abgerufen am 16. November 2017</span>.</span><span style="display: none;" class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2Fde.wikipedia.org%3AFluidit%C3%A4t&rft.title=Fluidit%C3%A4t&rft.description=Fluidit%C3%A4t&rft.identifier=https%3A%2F%2Fwww.spektrum.de%2Flexikon%2Fbiologie%2Ffluiditaet%2F25329&rft.publisher=spektrum.de"> </span></span>
</li>
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