Introduction

For the science fair, we have decided to conduct an experiment on how water conducts more or less electricity when different substances like salt and baby powder are added to it.  We will connect a range doubler to a wire and put the wire into the bowl of water.  We will then connect another separate wire to a pair of AA batteries.  Based on how much the needle moves when we add a substance to the water, we will know if that substance makes the water more or less conductive.

The materials we will be adding to the water are salt, baby powder, vinegar, sugar, and lemon juice.  We will add each material separately.

Our hypothesis is that the materials will conduct electricity in this order from most conductive to least conductive: vinegar, lemon juice, salt, sugar, and baby powder.  This is our hypothesis because lemons have electricity in them so we have chosen the more salty materials first.

The variables are as follow: our independent variable is the materials added to the water (putting an equal amount of each substance in the water is essential). Our dependent variable is the amount of electricity that flows through the water to the light bulb.