How to find out Oxygen ratio in air

How to find out Oxygen ratio in air

Level Elementary

Concept
The ratio of oxygen in air is 1/5(21%). Let’s confirm it by simple experiments. by Iron rusting

Materials

steel wool, glass vessel or PET bottle, wire, plate and water

Procedure

1. Make the wire support for the steel wool.
2. The steel wool is dampened by water a little.
3. The steel wool is put in the plate.
4. Water is put in the plate.
5. When the PET bottle is used, cut it in the form of a cylinder.
6. Cover the steel wool with the glass vessel or the PET bottle.
7. Leave it for half a day and confirm the water level and the ratio of the volume.

Science

The oxygen in air combines to iron and makes iron oxide. The gas oxygen is absorbed
in steel wool. Water enters in the container to the same amount of oxygen.

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