Scientists change the independent variable but measure the dependent variable; other variables are kept constant.
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Independent variables are variables that can be changed in an experiment, while dependent variables are variables that change as a result of an experiment. In other words, independent variables are what you change, and dependent variables are the results of the experiment.
The measurable variable is the variable that is measured in an experiment. It changes depending on the adjustment of the independent variable.
Variables work by telling you what you need to change, what to observe, and what to keep the same in a experiment.
They are the same. These are names for the variables in an experiment that are controlled by the experimenter, as opposed to the output variables, the results you collect at the end of the experiment Hope this helped!
These "variables" are called independent variables or constant variables meaning that they are capable of being changed by the experimenter but are intentionally held the same through each individual experiment.