Amusing Items

Your friendly neighbourhood AI (DuckDuckGo) says slightly lighter than air. Makes sense, my CO detector is higher than the boiler.
 
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By simple reasoning a molecule of CO is heavier than a molecule of O2. But by that same reasoning a molecule of water H2O is much lighter so why does water not float on air? Need a chemist to explain that to this layman.
 
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It's not just the mass of the constituent atoms, you also have to consider the overall volume those atoms occupy.
 
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