A '''process variable''' or '''process parameter''' is the current status of a process under control. An example of this would be the temperature of a furnace. The current temperature is called the process variable, while the desired temperature is known as the [[set-pointsetpoint (control system)|set-point]].
Measurement of Processprocess Variablesvariables are important in [[controlling]] a process. The Processprocess Variablevariable is a dynamic datafeature of the process which changesmay change rapidly. Accurate measurement of process variables is important for the maintenance of accuracy in a process. There are three commonly measured variables which affect chemical and physical process: [[pressure]], [[Thermodynamic_temperature|temperature]], and composition.
