Question

describe an activity to show that water contains air

Answer 1

when you free just the water or when you tries to convert the water into ice then some Bubbles are created in the ice.
this activity or experiment shows that air contains sorry water contains air

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Answer 2

Answer:

Aim : to show that water contains air

(Note: to be done under the supervision of an adult)

Things required : beakar , tripod stand ,spirit lamp ,and water

Method:

Take a beaker full of water put it on a tripod stand . Heat the beaker using the spirit lamp.

Observation : you will see with the bubbles on the surface of the beaker . These bubble will gradually rise up and pop out . Where do these bubble come from ? The air dissolved in water escapes on heating.

Conclusion: water to contain air .

Once the water start boiling, allow it to cool. Reheat the same water . Do you see the bubbles coming out again?