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<p>[QUOTE=&quot;desertgem, post: 822471, member: 15199&quot;]I have always found that people have a hard time with diffusion , thermodynamics, and gradients. When I had to explain that in the lungs, oxygen went into the blood, passing by carbon dioxide leaving the blood, (they could even bump into each other), it was contrary to most physical processes with which they were familiar. Your idea is easier. I liked the plastic enclosure as it did give me an indication of levels.&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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