Gases have been observed to travel from higher concentrations to lower concentrations for so long, and described to the satisfaction of most, such that it has even become a scientific "law", I think - and can even be applied to soluble substances in liquids. There are mathematical equations that describe the dispersion/diffusion movements in gases and liquids, one of the earliest which was described and calculated by Albert Fick, a German medical researcher. http://en.wikipedia.org/wiki/Fick%27s_law_of_diffu... might help to get the basic ideas and principles. Great question!
"Smell" is just gas particles that diffuse across less concentrated air of those particles to your nose. For example, when someone releases gas, the methane molecules diffuse across the air inbetween you and the origin (but) and reach your nose. Rule: High to low concentration
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SCENT or odor,not "smell".
AIR currents;has nothing to do w/what sort of scent. Ever watch a dog scenting?
Gases have been observed to travel from higher concentrations to lower concentrations for so long, and described to the satisfaction of most, such that it has even become a scientific "law", I think - and can even be applied to soluble substances in liquids. There are mathematical equations that describe the dispersion/diffusion movements in gases and liquids, one of the earliest which was described and calculated by Albert Fick, a German medical researcher. http://en.wikipedia.org/wiki/Fick%27s_law_of_diffu... might help to get the basic ideas and principles. Great question!
"Smell" is just gas particles that diffuse across less concentrated air of those particles to your nose. For example, when someone releases gas, the methane molecules diffuse across the air inbetween you and the origin (but) and reach your nose. Rule: High to low concentration