what is the main property that fractional distillation is based on?

i have HUGE SCIENCE booklet i have to do and i stuck on this question : main property that fractional distillation is based on? help please!

Answers
http://en.wikipedia.org/wiki/Fractional_distillation
javaid.aslam
12 June 2011
Heres a weblink that should be able to give you the answer to that question
javaid.aslam
12 June 2011
explain what chapter is that
sruli1234
12 June 2011
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