As we all know there are some materials that emit no smell (like glass). Does this have to do with the fact that these materials emit no smell atoms (molecules?) to begin with or the fact that we don't have the correct smell receptors in our noses?
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Smells are simply particles of a substance that gets up in the air. Glass has a smell, I've been to glass studios and smelled the air as sandblasting and glass moulding is going on, it's a rank, metallic odor.