Question

why air is invisible and why it has no smell​

Answer 1

Answer:

Air contains so few atoms, light waves run into very few of them when they shine through air. So the air looks transparent. If you put enough dust in the air, the particles of dust absorb the light and the air stops being transparent. Or, if you make the air incredibly thick, the air absorbs a lot more light.

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Answer 2

Answer:

Atmosphere is a mixture of gases and gases have a property of invisibility.

air is also a mixture of many gases that's why it is invisible.

when a large number of gases combine then the whole odour of all the gases will get cancelled. that's why air has no smell.