Science Buddies: "Ask an Expert"

Help!
Mt Topic is on permanent marker stains and stain removal. I used a cotton square and a polyester square and marked them four times with four diferent markers[1 of each for each cleaning agent used].Then I placed them into various cleaning agents. I need to know what is my dependant variable, independant variable, constant(s) and controled variables.
Please read this as soon as you can because this project is due on monday!

Hi,

Science Buddies has a great explanation of variables, here: http://sciencebuddies.com/science-fair- ... bles.shtml. It sounds like you have at least two independent variables and potentially several control variables; I'm still not completely clear on what you did and what you measured, though.

Take a look at the website and then post back if you still have questions.