A experiment should only have one variable.
2
one
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To eliminate confounding variables, or variables that were not controlled and damaged the validity of the experiment by affecting the dependent and independent variable, the experimenter should plan ahead. They should run many checks before actually running an experiment.
There's no "Limit", but the less you have, the better the experiment.
ONE :)
Just one at a time
An experiment of any kind can have infinitely many variables. A controlled experiment can have just as many, provided that all but one are kept exactly the same.
It depends what kind of experiment you do. For some you just need one. For others you may change two variables. In most cases you only change one
Variables that do not change in an experiment are independent variables.
Variables that do not change in an experiment are independent variables.
An experiment involves three types of variable.The independent variable is the one you are investigating. It is the one which you deliberately vary in the experiment. You should only have one independent variable.The dependent variable is the variable which you measure to get your results. Often there is only a single dependent variable but there can be more.All other variables must be controlled ie kept constant so they do not change the result. There are usually many control variables in an experiment.