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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 ...
http://www.gcsescience.com/iupwarddel.htm
A gas that is less dense than air can be collected by upward delivery. Examples of gases that can be collected by this method are ammonia and hydrogen. A gas jar is connected by a tube to the flask that is giving off the gas as shown in the picture below. The gas...
http://www.gcsescience.com/idownwarddel.htm
by downward delivery. Examples of gases that can be collected by this method are carbon dioxide, chlorine, hydrogen chloride and sulfur dioxide. A gas jar is connected by a tube to the flask that is giving off the gas as shown in the picture below. The gas that is more dense than air falls to the bottom
https://sg.answers.yahoo.com/question/index?qid=20100105050115AAyFb2g
Jan 05, 2010 · Best Answer: Gases which are denser (heavier) than air. e.g. carbon dioxide, chlorine tend to move downwards and hence the source of supply has to be higher in elevation than the destination and its called downward delivery. gases which are less denser (lighter) than air.
https://myschool.ng/questions/view/academic-questions/76617
Just know this:the heavier gas will always carry the lighter one and you can determine its weight by calculating its RMM.Heavy gases are always collected by upward displacement of air/downward delivery while light gases are collected by downward displacement of air/upward delivery.
https://medlineplus.gov/ency/patientinstructions/000621.htm
Delivery presentations. Delivery presentation describes the way the baby is positioned to come down the birth canal for delivery. Your baby must pass through your pelvic bones to reach the vaginal opening. The ease at which this passage will take place depends on how your baby is positioned during delivery.
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