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<p>Each volatile substance has its own frost line (e.g., carbon monoxide, <a href="page.php?w=nitrogen">nitrogen</a>, and <a href="page.php?w=argon">argon</a>), so it is important to always specify which material's frost line is referred to, though omission is common, especially for the water frost line. A <a href="page.php?w=tracer_gas">tracer gas</a> may be used for materials that are otherwise difficult to detect; for example <a href="page.php?w=diazenylium">diazenylium</a> for carbon monoxide.</p>

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<p>Different volatile compounds</p><p>
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