Wednesday, January 20, 2010

What is my control variable?

My experiment is the effect of fabric softener on drying time.





I will be adding fabric softener to the dryer cycle of clothes and time it to see if fabric softener effects the drying time.





My idependent variable is fabric softener.





My dependent variable is drying time.





But, I dont know what my control variable is!What is my control variable?
Your control variable is what you put in the dryer. Each dryer load, whether with or without softener, must be pretty much the same in material, volume and dampness.

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