text: can someone please help me with my science fair project? my project is ''how do the levels of salt and vinegar affect the amount of gas produced by electrolysis of water?  i dont know how or where to begin so please help me. •hundreds of free science fair projects are categorized under the following topics.   http://www.freesciencefairproject.com/  http://www.scienceproject.com/  http://www.ipl.org/div/projectguide/  http://www.all-science-fair-projects.com/  http://www.energyquest.ca.gov/projects/index.html  http://collaboratory.nunet.net/timber/scifair/2proj.htm  http://www.ipl.org/div/kidspace/projectguide/  http://www.niles-hs.k12.il.us/jacnau/ijas/  http://www.plymouthschools.com/science/scifair/scicover.htm  good luck.  kevin, liverpool, england.