Question

why the smell of cooking can drift from the kitchen to the living room even when there is no wind

Answer 1

Heya✌️✌️☺️☺️☺️...
It's due to the process known as diffusion that is movement of molecules from higher concentration to lower concentration...
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Answer 2

Answer:

the phenomenon can be explained if we think of matter as being made up of tiny descrete paricles which are in constant and random movement you can smell cooking from across a room beacuse the particles have travelled to you a region where they are more concentrated