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<p>[QUOTE=&quot;-jeffB, post: 2914072, member: 27832&quot;]Well, if you want to go down the &quot;technical&quot; route, it&#039;s probably not a <i>complete</i> vacuum anyhow. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" /></p><p><br /></p><p>Solids that react: one of the most memorable reactions from my old Gilbert chemistry set was heating iron filings and sulfur together. Okay, the sulfur melted -- but then they started reacting to form ferrous sulfide, and generating enough heat to glow red. (And the resulting gunk <i>never</i> came all the way out of the test tube.)</p><p><br /></p><p>Most pyrotechnic mixes are solid-phase, although of course they don&#039;t stay that way for long, at least not entirely. Some are used for rocketry.</p><p><br /></p><p>And coming back down to Earth, I&#039;m not <i>sure</i> pure solid-phase silver and sulfur would react -- but I&#039;d be surprised if they didn&#039;t.</p><p><br /></p><p>Edit: oh, and look up ionic liquids. They have super-low vapor pressures, so they can be stable in vacuum, and they support all <i>kinds</i> of interesting chemistry.[/QUOTE]</p><p><br /></p>

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