Fill in the following blanks with suitable words.
The smell of a perfume reaches us by the process of______

Explanation

To fill in the blank in the sentence "The smell of a perfume reaches us by the process of______," we need to identify the correct term that describes how the smell travels through the air.

### Step-by-Step Solution:

1. **Understanding the Context**: The question is about how the smell of perfume reaches us. This involves the movement of particles in the air.

2. **Identifying the Process**: The process that describes how particles spread from an area of high concentration to an area of low concentration is known as diffusion.

...