When an incense stick has lightened the vapours from it are large enough that they are visible to the naked eye. Does that mean that it forms a heterogeneous mixture with air?
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Solution
Heterogenous mixture:
"A heterogeneous mixture is that in which the composition of the mixture is not uniform throughout."
It consists of two or more phases.
Incense stick:
When an incense stick is lighted, the vapours are visible.
It can be considered a heterogeneous mixture with air as the particles are called dispersed phase and the air is called dispersion medium.