A scientific experiment is a procedure that one uses to test the laws of nature or to find the laws's breaking points. An experiment can be an observation that is designed to test a theory. An experiment is different from a test, which is an evaluation of a person or thing. The results of an experiment are usually not exact and sometimes not applicable to the real world, but they can be used to estimate the likelihood of a theory being true. An example of an experiment is the test of a person's vision. The person is placed in front of a mirror, and they are asked to look at it. If the person's vision is better, then the theory that they are better looking is correct.

The formula is a mathematical expression that is used to describe a physical process or the behavior of a physical system. A formula is usually written in the form of a mathematical equation. There are two types of formulas: ones that describe the behavior of a system, and the other that describe the result of an experiment.