Entropy of fusion

<h2 id="helium">Helium</h2>
<p><a href="/facts/Helium-3/SmPC5oT3">Helium-3</a> has a negative entropy of fusion at temperatures below 0.3 K. <a href="/facts/Helium-4/vNsL5qhC">Helium-4</a> also has a very slightly negative entropy of fusion below 0.8 K. This means that, at appropriate constant pressures, these substances freeze with the addition of heat.<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a>
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<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Entropy_of_vaporization/o95Ma456">Entropy of vaporization</a></li></ul>
<h2 id="notes">Notes</h2>

<ul><li>Atkins, Peter; Jones, Loretta (2008), <i>Chemical Principles: The Quest for Insight</i> (4th ed.), W. H. Freeman and Company, p. 236, <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-0-7167-7355-9</li>
<li>Ott, J. Bevan; Boerio-Goates, Juliana (2000), <i>Chemical Thermodynamics: Advanced Applications</i>, Academic Press, <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 0-12-530985-6</li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>Atkins & Jones 2008, p. 236. - Atkins, Peter; Jones, Loretta (2008), Chemical Principles: The Quest for Insight (4th ed.), W. H. Freeman and Company, p. 236, ISBN 978-0-7167-7355-9 <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>Ott & Boerio-Goates 2000, pp. 92–93. - Ott, J. Bevan; Boerio-Goates, Juliana (2000), Chemical Thermodynamics: Advanced Applications, Academic Press, ISBN 0-12-530985-6 <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
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Entropy of fusion open-in-new

Entropy of fusion