Experiment- a scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact
Variable: an element, feature, or factor that is liable to vary or change
Independent variable- a variable (often denoted by x) whose variation does not depend on that of another.
dependent variable-a variable (often denoted by y) whose value depends on that of another.
Controlled variable- A variable that you can change
Purpose- the reason for which something is done or created or for which something exists