all but 1...the 1 yu want tu test.
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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.
In case of BOYLE'S law,temperature is held constant! thank you!!
In Charles' Law, the mass is held constant which means that the pressure on the gas is constant.
The gauze bandage was held tightly so as to keep constant pressure on the wound.
A control variable is a variable that is held constant in a research analysis.