A testable variable is what you test several times for a scientific investigation or medical investigation.
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That the surface tension of water varies with the water's temperature. In this case, temperature would be the independent variable and surface tension would be the independent variable.
when you perform the experiment
Hypothesis
A scientific hypothesis has to be testable.
an independent variable is a thing you can change on your own. a depentent variable is a variable you depend on and a responding variable is a variable that reacts to the experiment