A student suspends a nail in four different liquids to determine which solution will rust a nail first. She uses tap water, salt water, lake water, and bottled water.
The nails are left in the liquids until a change is observed. Solution levels in each beaker are kept constant. Which is the dependent variable in this investigation?
the nails
the types of water
the amount of rust
the different containers
1 answer
the amount of rust is the dependent variable in this investigation.