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bacicallly a chemical reaction may give out a gas it my or may be poisonous so when u are in a welll ventillated area d gas mixes wit air n beecomes dillute so now it is jst a smalll dose which wont hurt u ........... n simlarly if u r some where lesss lets say space d gas would harm u as there is not fresh air ...........kool:

ohh,that makes sense