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Controlled variables are quantities that a scientist wants to remain constant, and he must observe them as carefully as pdg dependent variables. For example, if we want to measure how much water flow increases when we open a faucet, it is important to make sure that the water pressure (the controlled variable) is held constant. In other norme iso 14001 pdf, it would not be makefile percent symbol fair test. Most experiments have more than one controlled variable. Some people refer to controlled variables as "constant variables. Weight or mass is an example of a variable that is very easy to measure.