Cecily Zamora
The progression of a scientific theory to a scientific law is a topic that often arises in discussions between scientists and the general public. Scientific laws and theories are strengthened by people questioning what is or has been accepted, and both can be proven wrong if data suggests so. A scientific theory explains how nature works and is often non-mathematical, while a scientific law describes what nature does under certain conditions and is often defined mathematically. A theory becomes a law once it has been thoroughly tested and accepted.
Characteristics of Scientific Theories and Laws
| Characteristics | Values |
|---|---|
| Definition | Scientific theory: An explanation of an aspect of the natural world that has been or can be repeatedly tested and has corroborating evidence in accordance with the scientific method. Scientific law: An empirical description of a relationship between facts and/or other laws. |
| Nature of Work | Scientific theory: Explains how nature works. Scientific law: Describes what nature does under certain conditions and predicts outcomes. |
| Mathematical Nature | Scientific theory: Often non-mathematical. Scientific law: Often mathematically defined. |
| Discipline-Specific | Most "Laws" or "Theories" are discipline-specific, e.g. biologists are not qualified to critique the "Theory of Relativity," and physicists/chemists are not qualified to discuss the "Theory of Evolution." |
| Detractors | Scientific theories and laws can be questioned, modified, or rejected if they are shown to be wrong with sufficient data and evidence. |
| Proof and Evidence | Theories are supported by evidence from multiple sources and may contain one or several laws. Laws are well-supported by observations and/or experimental evidence. |
| Relationship | Theories and laws are both produced from the scientific method through the formation and testing of hypotheses. Theories do not become laws with the accumulation of new evidence. |
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What You'll Learn
Scientific laws are based on repeated experiments or observations
An example of a scientific law that was formulated based on repeated experimental observations is the First Law of Motion, also known as the Law of Inertia. This law, formulated by Isaac Newton, states that an object at rest will remain at rest, and an object in motion will continue moving with a constant velocity unless acted upon by an external force. This law was derived from observing the behaviour of objects in motion and at rest and has been repeatedly validated through experimentation.
Another example is the law of conservation of mass, which was the first law to be understood through macroscopic physical processes involving masses. It was observed that mass was conserved in all chemical reactions, and this law provided a fundamental understanding of physical interactions. However, with the development of relativity and nuclear physics, it was discovered that mass could be transformed into energy and vice versa, leading to a more general conservation of mass-energy.
It is important to note that scientific laws are subject to ongoing testing and scrutiny. While they may be universally accepted within the scientific community, new evidence or conditions may lead to modifications or expansions of existing laws. For instance, well-established laws have been found to have limitations in certain special cases, leading to the creation of new formulations that build upon the original laws while accounting for previously unconsidered factors.
In summary, scientific laws are the product of repeated experiments or observations, and they serve as empirical conclusions that describe and predict natural phenomena. These laws are constantly refined and tested to ensure their accuracy and applicability across different conditions. The process of formulating scientific laws involves moving from hypotheses to theories and finally to laws as experimental evidence accumulates and consensus is achieved within the scientific community.
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Scientific laws are subject to change
A scientific law describes an observed phenomenon in nature, often expressed as a mathematical statement. For example, Newton's Law of Universal Gravitation describes the relationship between the force of gravity and the masses of two objects and the distance between them. However, this law only applies in weak gravitational fields. If the circumstances change, the implications of the law would also change. For instance, if an apple and the Earth were to shrink to a subatomic size, the behaviour of these objects would be different, and the law would not apply in the same way.
Scientific laws are also subject to change when new evidence or theories emerge that contradict, restrict, or extend the original law. For example, the early laws of aerodynamics, such as Bernoulli's principle, do not apply in the case of compressible flow, such as in transonic and supersonic flight. In such cases, new formulations are created to explain the discrepancies, building upon the original laws and making them more precise and generalizable to a wider range of conditions.
The evolution of scientific laws is also influenced by changes in experimental methods and the control of variables. For instance, in medical drug testing, it was once common practice to simply give a drug to a group of people with a condition to test its efficacy. However, this method did not account for other factors such as diet, exercise, and stress levels, which could also influence the outcome. As a result, the scientific community now employs controlled trials, where one group receives the drug (the active group) while another group does not (the control group), to better isolate the effects of the drug.
Furthermore, the theory of experimenter's bias has led to the adoption of double-blind trials, where neither the researchers distributing the pills nor the participants know who is receiving the drug and who is receiving a placebo. This helps to eliminate potential biases and unintended cues that could influence the results.
In summary, scientific laws are subject to change as science is a dynamic and evolving field. New evidence, theories, and experimental methods can all contribute to the modification or refinement of existing laws. This process of continual revision and improvement helps to ensure that our understanding of the natural world is as accurate and comprehensive as possible.
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Scientific laws are not absolute
Scientific laws are often formulated as one or more statements or equations that can be used to predict the outcome of an experiment. For example, Newton's Law of Universal Gravitation can be written as an equation that includes the force of gravity, the universal gravitational constant, the masses of the objects, and the distance between them.
However, scientific laws do not explain why a phenomenon exists or what causes it. They are also limited in their applicability to circumstances resembling those already observed. For instance, Ohm's law only applies to linear networks, and Newton's law of universal gravitation only applies in weak gravitational fields. These laws are useful within their specified conditions, but they may be found to be false when extrapolated beyond their original scope.
Furthermore, scientific laws can be contradicted, restricted, or extended by future observations. While they are considered true within their regime of validity, they are not absolute in the sense that they can never be invalidated or proven to have limitations. For example, well-established laws have been invalidated in some special cases, leading to new formulations that generalize and improve upon the original laws.
In summary, scientific laws are not absolute truths. They are iterative, based on degrees of confidence, and subject to refinement as our understanding of the world evolves. They are a crucial part of the scientific process, but they are always open to further testing, validation, and potential modification.
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Scientific laws are often expressed mathematically
The use of mathematics in scientific laws dates back to the 17th century in Europe, with the development of advanced forms of mathematics and the emergence of accurate experimentation. Natural philosophers such as Isaac Newton and René Descartes were influenced by religious views, believing that God had instituted absolute, universal, and immutable physical laws. Descartes described "nature" as unchanging matter created by God, with changes occurring according to the "laws of nature."
The mathematical nature of scientific laws is also evident in the field of chemistry, with the law of microscopic reversibility stating that all chemical processes are reversible, although some may have an energy bias that makes them essentially irreversible. The Arrhenius equation, for instance, provides the mathematical relationship between temperature and activation energy dependence of the rate constant, an empirical law.
In physics, Kepler's three laws of planetary motion, formed in the early 17th century, describe how planets orbit the sun mathematically. The first law, the law of orbits, states that planets move in elliptical orbits around the sun. The second law, the law of areas, states that a line connecting a planet to the sun covers an equal area over equal periods, regardless of where measurements begin.
Additionally, scientific laws are often expressed mathematically through Noether's theorem, which connects conservation laws to certain symmetries. For example, in special relativity, rapidity is used to express motion according to the symmetries of hyperbolic rotation, a transformation that mixes space and time.
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Scientific laws are different from scientific theories
Scientific laws and scientific theories are two different concepts, and it is essential to understand their differences. Both laws and theories are integral to science and are closely related, but they serve distinct purposes and have unique characteristics.
A scientific law is a statement that describes an observed phenomenon in nature. It is based on repeated experiments or observations and can be summarised mathematically. For example, Newton's Law of Universal Gravitation can be summarised with the equation: Fg = Gm1m2/d^2. Here, Fg is the force of gravity, G is the universal gravitational constant, m1 and m2 are the masses of the two objects, and d is the distance between them. Laws are developed from data and can be further refined through mathematics. They are always based on empirical evidence and are discovered, not invented. However, they do not explain why a phenomenon occurs or what causes it. They are also not absolute and can be invalidated or proven to have limitations under certain conditions.
On the other hand, a scientific theory is an explanation of the natural world that can be repeatedly tested and verified using the scientific method and observation. It is a reliable account of how a certain natural phenomenon works and seeks to synthesise a body of evidence or observations. Theories provide a verifiable explanation for observed phenomena and are not mere guesses. For example, the theory of gravity explains why an apple falls to the ground when dropped. Theories are grander statements about how nature operates and are not confined to a specific set of conditions, as laws often are.
In summary, a scientific law predicts what happens, while a scientific theory explains why it happens. Laws are formed through repeated observations or experiments, while theories are developed from these laws to explain the underlying mechanisms. Theories are broader in scope than laws, as they may entail one or several laws.
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Frequently asked questions
A scientific theory is an explanation of an aspect of the natural world that has been repeatedly tested and has corroborating evidence. A scientific law is a description of how nature will behave under certain conditions.
No, a theory does not become a law. A theory explains how nature works, while a law describes what nature does under certain conditions.
Both scientific laws and theories are produced from the scientific method through the formation and testing of hypotheses.
Yes, both scientific laws and theories could be proven wrong if data and evidence suggest so.
