Cecily Zamora
There is a common misconception that scientific theories can become scientific laws. This misconception is often a result of the different meanings of the words theory and law in the language of science. In common usage, the word theory is synonymous with a hunch, but in science, a theory is a powerful explanation for a broad set of observations. For example, the theory of evolution is a well-supported and widely accepted explanation for the diversity of life on Earth. Theories are often based on a variety of scientific laws, facts, testing, and other evidence, all of which come together to explain how a part of the universe works. Laws, on the other hand, are simple facts and formulas that apply universally.
| Characteristics | Values |
|---|---|
| Hierarchy | Many people believe that ideas begin as hypotheses, then with some evidence they become theories, and finally, when the evidence is overwhelming, the idea becomes a law |
| Difference in purpose | Theories and laws serve different purposes. Theories are a set of ideas that help to explain how or why natural phenomena occur, while laws are usually mathematical relationships that describe what happens |
| Breadth | Theories and laws differ in breadth, not in the level of support. Theories apply to a broader range of phenomena than hypotheses |
| Acceptance | Theories must be strongly supported by many different lines of evidence to be accepted by the scientific community |
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What You'll Learn
The misconception that theories become laws
There is a common misconception that theories can become scientific laws. This misconception stems from a misunderstanding of how science works and the different purposes served by theories and laws.
Many people believe that scientific ideas progress through a hierarchy, starting as hypotheses, then becoming theories with evidence, and finally evolving into laws when there is overwhelming evidence. However, this hierarchy is incorrect. The difference between theories and laws is not determined by the amount of supporting evidence or the level of acceptance within the scientific community.
Theories and laws have distinct roles in science. Theories are sets of ideas that explain how or why natural phenomena occur, providing broad explanations for a wide range of observations. They are concise, coherent, systematic, predictive, and broadly applicable. For example, the theory of natural selection applies to all populations with some form of inheritance, variation, and differential reproductive success, helping us understand and make predictions about various observations. Theories often integrate and generalize multiple hypotheses, forming a powerful explanation that is strongly supported by various lines of evidence.
On the other hand, laws are typically mathematical relationships that describe what happens. They are simple facts and formulas that are basic and universally applicable. For instance, Ohm's Law, represented as I=V/R, describes the relationship between amperage, voltage, and resistance in an electrical circuit. Laws provide fundamental descriptions of natural phenomena, while theories offer broader explanations and help us understand why these phenomena occur.
It is essential to understand these distinctions to clarify the misconception that theories become laws. Both theories and laws are integral components of scientific understanding, each serving their unique purpose in explaining the natural world.
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Theories are broad explanations for a wide range of phenomena
There is a common misconception that scientific ideas progress through a hierarchy, from hypothesis to theory to law. However, this is not the case. Theories and laws differ in breadth, not in the level of support. Theories are broad explanations that apply to a wide range of phenomena and are based on various scientific laws, facts, testing, and evidence. They are concise, coherent, systematic, predictive, and broadly applicable. For example, the theory of natural selection applies to all populations with some form of inheritance, variation, and differential reproductive success, whether that population is composed of alpine butterflies, fruit flies, or even bits in a computer's memory. This theory helps us understand a diverse range of observations and make predictions in new situations.
Theories are developed from hypotheses, which are initial guesses or hunches about what might happen. Scientists investigate hypotheses by following a line of reasoning and formulating theories. These theories are then tested and, if accepted, become established scientific explanations. It is important to note that theories do not become laws; they serve different purposes. Theories explain how or why natural phenomena occur, while laws are typically mathematical relationships that describe what happens. Laws are simple, basic facts and formulas that apply universally. For instance, Ohm's Law states that in an electrical circuit, amperage is equal to voltage divided by resistance.
The distinction between theories and laws can be challenging to grasp due to the different meanings of the words "theory" and "law" in scientific and everyday language. In common usage, "theory" may refer to a hunch or conjecture, but in science, it holds a more robust meaning. A scientific theory is a well-supported and widely accepted explanation for a broad set of observations. Even within the scientific community, the term "theory" is sometimes misused, leading to confusion.
It is worth mentioning that scientific theories are not static and can evolve as new evidence emerges. When new discoveries contradict existing theories, scientists develop new theories that fit both the new and old evidence. These new theories are then rigorously tested, and if they withstand scrutiny and gain broad acceptance, they become established theories. However, it is essential to understand that theories do not graduate to laws; they occupy distinct roles in the scientific understanding of the world.
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Laws are simple facts and formulas that apply universally
There is a common misconception that scientific ideas progress through a hierarchy, from hypotheses to theories and finally to laws when the evidence becomes overwhelming. However, this is not the case. Theories and laws serve different purposes and have distinct meanings in the language of science.
Theories are a set of ideas that provide concise, coherent, and systematic explanations for a wide range of phenomena. They are generally not a long list of exceptions and special rules and are supported by multiple lines of evidence. For example, the theory of natural selection applies to all populations with some form of inheritance, variation, and differential reproductive success, making predictions and proving itself time and again. Theories often integrate and generalize many hypotheses, and some hypotheses can be so complex that they are expressed as mathematical equations or computer programs, also known as models.
On the other hand, laws are simple facts and formulas that apply universally. They are usually mathematical relationships that describe what happens in a given situation. For instance, Ohm's Law, with the formula I=V/R, tells us that in any electrical circuit, the amperage is equal to the voltage divided by the resistance. Laws provide basic and fundamental descriptions of natural phenomena, often forming the foundation for more complex theories.
While theories do not evolve into laws, they are integral components of the scientific process. Theories help us understand and predict the behaviour of natural systems, and when a theory is proven wrong or flawed, scientists work to modify or replace it with a new theory that better fits the observed evidence. This iterative process of scientific investigation and theory refinement drives our understanding of the universe forward.
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The difference between theories and laws is not how much evidence supports each
Scientific laws and theories are similar in character but are not synonymous terms. They are not different in how much evidence supports each, nor how well the idea is accepted in the scientific community. Rather, theories and laws serve different purposes.
A scientific law predicts the results of certain initial conditions. It might predict your unborn child’s possible hair colours or how far a baseball travels when launched at a certain angle. In contrast, a theory tries to provide the most logical explanation about why things happen as they do. A theory might invoke dominant and recessive genes to explain how brown-haired parents ended up with a red-headed child, or use gravity to shed light on the parabolic trajectory of a baseball. Theories are a set of ideas that help to explain how or why natural phenomena occur. Laws are usually mathematical relationships that describe what happens.
Theories and laws both need to explain and predict to be considered credible. Most laws and theories attempt to explain, some better than others. Many theories do not have predictive power, although we would expect all laws to have strong predictive powers. Theories tend to be as broad as their supporting scientific evidence will permit. They seek to serve as a definitive explanation of some aspect of the natural world.
The scientific method involves formulating hypotheses and testing them to see if they hold up to the realities of the natural world. Successfully proven hypotheses can lead to either scientific theories or scientific laws. A theory begins as a hypothesis: a proposed explanation for a natural phenomenon. In order to turn a hypothesis into a proven theory, researchers design science experiments to challenge their ideas under the conditions of the natural world.
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The hierarchy of hypotheses, theories, and laws
There is a common misconception that scientific ideas progress through a hierarchy, starting as hypotheses, then becoming theories when some evidence is found, and finally turning into laws when there is overwhelming evidence. However, this is not accurate. The hierarchy of hypotheses, theories, and laws serves different purposes and has distinct roles in the scientific process.
Hypotheses are the foundational layer of this hierarchy. They are structured in a hierarchically nested way, with lower branches directly connected to empirical results. This allows researchers to connect hypotheses to diverse experimental outcomes and identify the circumstances under which they are applicable. The hierarchy-of-hypotheses (HoH) approach is a valuable tool for organizing evidence and uncovering the underlying mechanisms and conceptual connections within hypotheses.
Theories are a set of ideas that provide a high-level explanation for natural phenomena. They can consist of a well-defined set of mechanistic rules or natural laws, or they may be a loose collection of frameworks, ideas, and hypotheses. Theories help explain and understand ecological, evolutionary, or other complex systems.
Laws, on the other hand, are typically mathematical relationships that describe what happens in a given situation. They are often quantitative and precise, providing a concise description of a phenomenon.
It is important to note that theories do not evolve into laws. They have distinct roles and serve different purposes in the scientific process. Theories provide explanations and understanding, while laws describe what happens without necessarily explaining why.
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Frequently asked questions
No, theories cannot become laws because they serve different purposes. Theories are a set of ideas that explain how or why natural phenomena occur, while laws are mathematical relationships that describe what happens. Theories are broad explanations for a wide range of phenomena and are generally concise, coherent, systematic, predictive, and broadly applicable.
In the language of science, the words "theory" and "law" have distinct meanings. Theories are powerful explanations for a broad set of observations, while laws are simple facts and formulas that are basic and universally applicable. For example, Ohm's Law states that in an electrical circuit, amperage is equal to voltage divided by resistance.
Scientists often begin with a hypothesis, which is a guess or a hunch about what might happen. When investigating a hypothesis, scientists follow a line of reasoning and may formulate a theory. A theory, in scientific terms, must be strongly supported by multiple lines of evidence to be accepted by the scientific community. Hypotheses, theories, and laws are all scientific explanations that differ in breadth, not in the level of support.
