That which is variable; that which varies, or is subject to change.

A condition in a scientific experiment or observation that is subject to change. A variable factor in which change occurs naturally or is made to occur by the investigator is called the independent variable; a variable that changes as a result of change in the independent variable factor is called the dependent variable.

An element or factor that the research is designed to study, either as an experimental intervention or a possible outcome (or factor affecting the outcome) of that intervention.

A factor that affects the results of an investigation. Variables are things that could change during an investigation or experiment (e.g., the amount of sunlight received by a plant).

a factor tha has an influence on the outcome of an experiment or study

A water quality constituent (for example, total phosphorus pollutant concentration) or other measured factors (such as stream flow, rainfall).

Any condition that is measured, controlled (directly or indirectly) or manipulated.

A property that can take different values. In research designs variables are classed as independent and dependent.

A part of an experiment that can be changed or altered depending on what is being investigated.

A variable is an 'object' that is being investigated in a research study and that is considered to be capable of varying. A variable can be (a) dependent ie the effect or response to what the researcher does, or (b) independent ie what the researcher does or controls.

variable is what is measured or manipulated in an experiment. Variables provide the means by which scientists structure their observations.

Something that can be counted or measured and that can change during an experiment. This includes age, sex, weight, height, income, behaviour and so forth. Variables are used in scientific research: for instance, when testing a new drug for protecting against cancer, the ‘independent variableâ€(tm) (the one that can be controlled by either being given or not given to a participant) is the new drug and the ‘dependent variableâ€(tm) (the effect measured after manipulating the independent variable) is the occurrence of cancer.

A factor that can be altered, measured, or controlled.

A changing entity of a situation or interaction that directly or indirectly alters the outcome.

Any characteristic that may vary in study subjects, such as gender, age, body weight, diet, behavior, attitude or other attribute. In an experiment, the treatment is called the independent variable; it is the factor being investigated. The variable that is influenced by the treatment is the dependent variable; it may change as a result of the effect of the independent variable.

Something that takes on different values that can be measured or counted. If one variable can be controlled exactly (such as the selling price of apples) then it is called an 'independent variable', while the remaining variable (in this case the number of apples bought) is called a 'dependent variable'

(... factor) A variable is anything that can change. independent variable (... input variable) The one you change, independently, through a series of preset values dependent variable (... output variable) The one you want to find out about. Its value depends upon the value you set the independent variable to. control variable Any other variable in the experiment. Its value must be kept the same throughout the experiment to ensure a fair test.

One of the conditions measured or controlled in an experiment. See also dependent variable, independent variable.

A condition or a factor that can be monitored, measured, and/or altered by a control, such as temperature, current, voltage, humidity, liquid level, pressure, etc.