Question

if we cannot see air ,why do we sometimes see the smoke from a factory chimney

Answer 1

Those are dust and carbon particles which are black in colour and hence visible

Answer 2

Here's Your Answer !!

We can see smoke due to this reason !!

Smoke is a collection of tiny solid, liquid and gas particles. Although smoke can contain hundreds of different chemicals and fumes, visible smoke is mostly carbon (soot), tar, oils and ash. Smoke occurs when there is incomplete combustion (not enough oxygen to burn the fuel completely).

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