What is the process where you smell delicious odor of baking cookies even before enter kitchen?

The process of smelling delicious baking cookies before entering the kitchen is called diffusion.

Here's how it works:

* Vaporization: When cookies bake, the heat causes the ingredients (like butter, sugar, and vanilla) to release volatile compounds. These compounds evaporate and become tiny particles in the air.

* Diffusion: These volatile compounds spread out from the source (the oven) and move through the air. This process is called diffusion, and it's driven by the natural tendency of particles to move from areas of high concentration to areas of low concentration.

* Olfactory receptors: When the vaporized compounds reach your nose, they interact with specialized olfactory receptors. These receptors send signals to your brain, which interprets them as the smell of delicious baking cookies.

So, the cookies themselves aren't actually travelling to your nose, but rather the smell molecules are spreading through the air until they reach your olfactory receptors. It's a fascinating example of how our senses work!