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The effect of gasoline fumes on plantsFeatured science projectScience project video

Conclusion

The hypothesis that longer periods of exposure to gasoline fumes, at higher temperatures  will result in quicker death of plants. Gasoline contains aromatic hydrocarbons like benzene that are carcinogenicand harmful to living organisms. Therefore, the occurrence of gasoline leaks are a big threat to public health and the environment. Gasoline is also extremely volatile and will evaporate more quickly at higher temperatures. Many safety factors must be taken into consideration to prevent leakage when designing and building gasoline storage tanks and transportation piping.

Also consider

Repeat the science fair project to study the effect of gasoline vapor on insects.

Alternatively, you could also try to ascertain if certain species of plants are more resilient in the presents of gasoline fumes

References

Gasoline - http://en.wikipedia.org/wiki/Gasoline

Environmental affects of ethanol and gasoline - http://www.sentex.net/~crfa/ethaenv1.html

Avoid evaporating gas - http://planetgreen.discovery.com/tech-transport/avoid-evaporating-gas-shade.html

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Complexity level:
5
Project cost ($):
40
Time required:
1 hour to prepare, 8 days for the science project experiment
Material availability:
Easily found
Safety concerns:

Extreme care and caution required to ensure that the gasoline does not ignite and to prevent inhalation. The assistance of adults is required and the experiment must be conducted in a properly equipped laboratory which is well ventilated. Fire safety gear and equipment required.