Help Rithesha to identify the correct answers:
Burning of an incense stick
A student lights an incense stick near the entrance of a classroom. Initially, the fragrance is strongest near the incense stick. After a few minutes, students sitting farther away can also smell it. No one carries the incense stick around the classroom.
1. Why does the fragrance not remain only near the incense stick?
2. Why can we smell incense even from a distance, but cannot see the fragrance particles?
3. Why are open windows or fans not necessary for diffusion to occur?