What is a controlled variable?

im not sure if that first answer was clear so...........

Anything in the emperiment that you have control for. for example say you are testing how fast water boils at a certain temperature. the temperature is the controlled variable because you can change the temperature yourself by increasing or decreasing the heat... the controlled variable is independent. If you had to make a chart or graph, it would be on the x axis... im not sure if thats any clearer

Main Entry: control variable

Part of Speech: noun

Definition: any factor that remains unchanged and strongly influences values; also, a factor held constant to test the relative impact of an independent variable

a controlled variable is the only one that you are not adding anything to it, it remains as it is to test the difference of the other when a substance is acted upon the other variables

Anything that could change in a scientific experiment that you control so it doesn't