Points in favour:

Question

1.Diffusion helps reduce the pollution of toxic gases.

Points against:
1. old stains of ink, tea/coffee, cooked food are hard to remove through diffusion, or just hard to remove ...

HELP PLS....V.V.IMPORTANT

Answer 1

It isn't obvious to me what question you are asking.

Answer 2

When a toxic gas such as nitrogen dioxide, sulfur dioxide, sulfur trioxide, chlorine or ammonia is accidentally released into the air it can cause extreme damage to all living organisms close to the point of leakage, however, when diffusion occurs, the gas, spreading over a larger area, would be of a lower concentration and therefore cause lesser damage to each individual. However this can also be seen as disadvantage of diffusion as without diffusion, the gas might not have leaked in the first place and it also spreads through a larger area due to diffusion, thereby affecting more people.

Old stains of ink, tea/coffee and cooked food are hard to remove due to diffusion as they stain a larger area and also diffuse through the layers of the cloth, making the stain more stubborn.

P.S. The points against one is just a hunch and I'm not really sure about that. I suggest you take a better source for that one, but I'm confident about my first answer. And your question isn't very clear, try rephrasing it. Good luck! :)

Answer 3

Old stains of ink, tea/coffee and cooked food are hard to remove as over time, the liquid diffuses into the cloth as well. Since the stain is not just on the surface but has also been absorbed by the cloth, it is harder to remove it.