Identify the examples of diffusion in the list below

1)Noxious smell of ammonia gas spread in the air  2)Cigarette smoke spreads into the air  3)Aroma of food spreads into the air

Explanation:

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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if you're asking what comes out, it's steam.