Experiment:
Experiment is defined as a procedure that is carried out to support, refute, or validate a hypothesis.
Variable:
Variable can be defined as a symbolic name associated with a value and whose associated value may be change.
Independent variable:
An independent variable is defined as the variable that is changed or controlled in a scientific experiment to test the effects on thedependent variable.
Dependent variable:
A dependent variable is defined as the variable that is being tested and measured in a scientific experiment.
Controlled variable:
Controlled variable is defined as an experimental element which is constant and unchanged throughout the course of the investigation.
Purpose:
Purpose is defined as the reason for which something is done or created or for which something exists.