Question

When your friend opens his lunch box, the smell spreads across the classroom. Why?

Answer 1

Answer:

Because the process of diffusion of gas(here smell of food) in air takes place.

Hope it's helpful..

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Answer 2

Answer:

because all class mates are hungry for eating the food... and the... beyond their own ...............this is acc to the science... as we see this as we.. think this as scientific way......this is acc to the diffusion .........

......cause.. gas diffusion. power is more than that of otherstates.... bcoz.. its.. .. interparticles are.. long distance aapart