|Water displacement |
Can be used for gases of any density provided the water solubility is low
|Gas syringe |
Can be used for collection of any gas.
|Upward delivery |
Can be used for gases with density less than air.
Once collected, the gas test-tube should be kept upside down (or its contents will be displaced by air).
|Downward delivery |
Can be used for gases that have a higher density than air.