A scientific theory is a well-reasoned explanation of an aspect of the natural world, based on a set of facts that have been repeatedly confirmed through observation and experimentation. Such fact-based theories are not «assumptions,» but reliable accounts of the real world. The theory of biological evolution is more than just a «theory.» This is as factual an explanation of the universe as the atomic theory of matter (which says that everything is made of atoms) or the germ theory of disease (which says that many diseases are caused by germs). Our understanding of gravity is still a work in progress. But the phenomenon of gravity, like evolution, is an accepted fact. The U.S. National Academy of Sciences describes a theory as follows: A principle is a basic rule, law, or concept. The Oxford Dictionary defines principles as «a fundamental truth or statement that serves as the basis for a belief or behavioral system or chain of reasoning,» while the American Heritage Dictionary defines it as «fundamental truth, law, or hypothesis.» Laws are general rules and ideas that adhere to the nature of the universe, while principles describe specific phenomena that require clarity and explanation. Other terms such as theorems, theories, and rules can describe nature and the universe. Understanding the differences between these terms in physics can improve your rhetoric and language when talking about science. The original German word describes the phenomenon more accurately than the word «uncertainty.» The uncertainty principle adds uncertainty to observations based on the inaccuracy of a physicist`s scientific measurements.
Because these principles are highly dependent on the context and conditions of the principle, they resemble guiding theories used to make predictions about the phenomena of the universe rather than laws. A principle is a rule or mechanism by which certain scientific phenomena work. Principles usually have more requirements or criteria if they can be used. They usually require more explanation to articulate, as opposed to a single universal equation. The main difference between theory and principle is that theory is a scientifically credible general principle that explains a phenomenon while principle is a truth, rule or fundamental law. Other terms may not be as clear. The difference between a rule and a principle can be debated, but rules usually refer to how to determine the correct answer from different possibilities. With the rule of law, physicists can determine how electric current, magnetic field, and magnetic force depend on each other in terms of direction. Although it is based on fundamental laws and theories of electromagnetism, it is used more as a general «rule of thumb» when solving equations in electricity and magnetism. Although many have taken science classes while studying, people often have misconceptions or misconceptions about some of the most important and fundamental principles of science. Most students have heard of assumptions, theories and laws, but what do these terms really mean? Before reading this section, think about what you`ve learned about these terms previously.
What do these terms mean to you? What do you read that contradicts or supports what you thought? A theory is a scientifically acceptable general principle that can explain a phenomenon. The Oxford dictionary defines it as «a conjecture or system of ideas intended to explain something, especially a system based on general principles independently of the thing to be explained», while the American Heritage dictionary defines it as «a set of statements or principles developed to explain a group of facts or phenomena, in particular one, which has been repeatedly tested or is widely accepted and can be used to make predictions about natural phenomena.» There are other examples of scientific principles in everyday life. It is impossible to distinguish between a gravitational force and the inertial force, the acceleration force of an object, known as the equivalence principle. It tells you that if you`re in free fall in an elevator, you wouldn`t be able to measure the gravitational force because you wouldn`t be able to distinguish between it and the force pulling you in the opposite direction of gravity. Scientific laws are similar to scientific theories in that they are principles that can be used to predict the behavior of the natural world. Scientific laws and theories are usually well supported by observations and/or experimental evidence. Usually, scientific laws refer to rules governing the behavior of nature under certain conditions, which are often written as an equation. Scientific theories are more general explanations of how nature works and why it has certain properties. For comparison, theories explain why we observe what we do and laws describe what happens. Video (PageIndex{1}): What is the difference between a scientific law and a theory? A principle can also refer to a value or code of conduct that guides behavior. Principles can be moral, legal or scientific.
Moral principles are the values that guide people`s behavior in a particular society.