1. What is upward displacement of air?
2. What is downward displacement of air?
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1)Upward displacement of air is the displacement of air in the upward direction as the gases are collected by downward delivery. ... The gas produced in a chemical reaction is passed through a delivery tube into the gas jar, where it sinks and pushes the air out of the top.
2) Downward displacement of air requires a gas that does not mix with air and is lighter than air. Hydrogen is lighter than air but mixes with air.
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