A more structured idea

My experiement will most likely be based on 'which liquids rust an iron nail fastest/faster'.

The depdendent variable will be the iron nail. The independent variable will be the types of liquids (such as water, salt water, oil, vinegar and methylated spirits).

I will be placing an iron nail into cups of liquids (most likely my mum's teacups), and placing them to rest to observe how fast they rust etc.

SO until next time! More ideas will follow...=]