<p><span class="h-card" translate="no"><a href="https://mastodon.social/@whitequark" class="u-url mention">@<span>whitequark</span></a></span><br />I think it is NaCl vapor and not Mg vapor, but if you notice overheating of crucible then it might be magnesium slightly. They actually have very similar specific heat of vaporization, but NaCl is still lower.</p>