Gases can be prepared in a number of different ways, depending on their properties.

Upward delivery[edit | edit source]

Done if the gas is less dense than air, for example hydrogen

Downward Delivery[edit | edit source]

Done if the gas is more dense than air, for example chlorine.

Collecting gases over water[edit | edit source]

Works well for gases insoluble in water, for example hydrogen.

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