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https://www.answers.com/Q/What_is_the_difference_between_upward_and_downward_delivery
some gases are denser than (heavier) air e.g. CO2, HCl, H2S, Cl2. are delivered by downward delivery. while gases which are Less dense than (lighter) air e.g. H2,NH3 are delivered by upward ...
https://www.answers.com/Q/Why_hydrogen_gas_collected_by_upward_delivery
May 17, 2009 · some gases are denser than (heavier) air e.g. CO2, HCl, H2S, Cl2. are delivered by downward delivery. while gases which are Less dense than (lighter) air …
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