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<p>[QUOTE=&quot;desertgem, post: 3205174, member: 15199&quot;]Unless I misinterpret your statement,</p><p><br /></p><p>Expansion and contraction of any material ( see reference below and note it is not limited to metals) are due to&nbsp; the size of the atoms including the shells ( due to increase or decrease in kinetic energy which is due to temperature change) so they do NOT stay WITHIN the original size , <u>both the atoms and the Boundaries of the physical object change size</u>, so no empty &quot;interstitial space&quot; is needed or found. There are no references I can find to the presence of interstitial space present in relationship to&nbsp; expansion/contraction, or crystallization.&nbsp; Jim</p><p><br /></p><p><a href="https://www.engineeringtoolbox.com/linear-expansion-coefficients-d_95.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.engineeringtoolbox.com/linear-expansion-coefficients-d_95.html" rel="nofollow">https://www.engineeringtoolbox.com/linear-expansion-coefficients-d_95.html</a>[/QUOTE]</p><p><br /></p>

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