the written report, should be completed using the worksheet you will download at the end of the lab introduction. Make sure you not only complete the table on page 1, but also include all parts of a scientific report starting on page 2: Title, Abstract, Introduction, Materials and Method, Results, Discussion, Conclusion, and References. While the written report does not need to be in APA format, it must have no more than 1″ margins, be double-spaced, and must include your name, date, and assignment listed in the header. The report must be neat, clean, and relatively free of spelling errors.

Note: I choose to have 3 different variables

Variable1: I named it Vj (which is only exposed to normal environment (sun, air…ect)
Variable2: I names it Vy (Which is exposed to smell of gas .
Variable3: I named it Vz ( Which is exposed to smoke of cigarette)

You can look up what the results could be in these 3 variable