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Awesome NASA documentary about Scientific Experience inside the NASA Space Station. An experiment is a procedure by which it is checked (confirm or verify) one or more hypotheses related to a particular phenomenon , by manipulating and studying the correlations of the variables that are presumably the cause. The experimentation is one of the key elements of scientific research and is critical to providing causal explanations . In one experiment they are considered all relevant variables involved in the phenomenon, by manipulating which are presumably the cause, control of extraneous variables and randomization (or randomization) of the others. These procedures can vary greatly disciplines (not just in physics in psychology , for example), but the same objective: to exclude alternative explanations (other than the manipulated variable) in explaining the results. This aspect is known as internal validity of the experiment, which increases when the experiment is replicated by other researchers and the same results. Each repetition of the experiment is called test or trial.