What term refers to something that can change and is different in each experiment?

The term that refers to something that can change and is different in each experiment is "variable." In the context of scientific experiments, a variable is any factor or condition that can be manipulated or altered. It is essential for experiments because it allows scientists to test hypotheses and observe the effects of changes on the outcomes.

Variables can be classified into different types, such as independent variables, which are intentionally changed by the experimenter, and dependent variables, which respond to those changes. The ability to isolate and identify these variables is fundamental in drawing meaningful conclusions from experimental data, as it helps determine cause-and-effect relationships.

In contrast, a constant refers to factors that remain unchanged throughout the experiment to ensure that the results can be attributed solely to the manipulated variables. An experiment itself is the overall process by which scientists test their hypotheses, and a parameter is a general term that can describe any measurable factor in a given context, but it does not specifically capture the idea of change. Thus, "variable" is the most accurate term for the concept of something that can change and vary between experiments.