some ideas

Ok so I did have a few ideas. One plan was to do the expansion of different metals when heated but I can't do that one because the expansion is too small to be measured. The independent variable there is the heat and expansion is the dependent variable.

I thought about a few other ideas too and did a bit of research. I wanted to build a solar powered fan and I did the research and it's possible but it is not the best thing to do because it's a bit difficult but it would make a good long-term project so I'm thinking about it. It wouldn't be an experiment but it would be the developing of the actual fan and building it. I think that would be fun but I would like to do an experiment. The materials for that experiment are a bit dangerous, like a soldering iron so that's another negative. Also, there are not really variables because it isn't an experiment.

I found another experiment I could do. It is to observe the effect of light on plants. The independent variable is amount of light received. The dependent variable is growth of plant. I think that this idea is fairly common though.

Another idea is how plants grow, as in, the direction that they grow in, relative to where the light is from. The independent variable is where the light is from and the dependent variable is what direction the plant grows in. However, again, I think that this idea is fairly common.