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Science Fair experiment for Rocket oven

 
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Hello big perms,
I am really hoping someone can help! My 12 y/o son will be building a rocket oven and wants to double it for use in some cool science fair experiment. Got any ideas that would make for an intriguing measurable experiment?
Anything would help.
Thanks!
 
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Location: missoula, montana (zone 4)
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how about:



 
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Location: Moved from south central WI to Portland, OR
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What about measuring the amount of fuel required to bake a pizza, and compare to the amount of fuel needed to bake a pizza with a cob oven (if you can find a cob oven - where I live in Portland Oregon that wouldn't be hard).
 
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