Kara Sears
Scientific laws and legal laws are two very different concepts, with the former being discovered through the scientific method and the latter being invented by humans. Scientific laws are generalised observations about the relationship between variables in the natural world, often expressed as mathematical equations, and are subject to change with new scientific discoveries. On the other hand, legal laws are rules invented by humans to govern society and enforce order, and they vary across different cultures and time periods. While scientific laws are discovered and based on empirical evidence, legal laws are invented and can be influenced by ethical, cultural, and political factors.
| Characteristics | Values |
|---|---|
| Definition | A law is a rule that governs behaviour or conduct, whereas a scientific law is a statement that summarizes the relationship between variables. |
| Basis | Laws are based on societal norms and values, while scientific laws are based on empirical evidence and observations. |
| Purpose | Laws maintain order and regulate behaviour, whereas scientific laws predict the behaviour of natural phenomena. |
| Flexibility | Laws are generally rigid and less flexible, whereas scientific laws are flexible and can evolve over time. |
| Exceptions | Laws may have some exceptions, but they are generally absolute. Scientific laws can have exceptions and be proven wrong. |
| Scope | Laws have a broad scope and cover a wide range of behaviours and conduct. Scientific laws are narrower in scope and focus on specific relationships and phenomena. |
| Change | Laws are difficult to change and require legislative processes. Scientific laws can be changed through scientific research and the discovery of new evidence. |
| Examples | Examples of laws include traffic rules or criminal laws. Examples of scientific laws include Newton's Laws of Motion or the Law of Universal Gravitation. |
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What You'll Learn
Scientific laws vs. facts
Scientific laws, scientific facts, and scientific theories are separate elements of the scientific method. They are not interchangeable, and each has a distinct meaning.
A scientific fact is an observation that has been repeatedly confirmed and is accepted as "true". However, nothing in science is ever proven to be absolutely true, and what is accepted as a fact today may be modified or discarded in the future. For example, the fact that apples fall from apple trees is a simple statement that can be proven true through observation.
A scientific theory is a well-substantiated explanation of a phenomenon that incorporates facts, laws, inferences, and tested hypotheses. Theories are broader in scope than laws and provide overarching explanations of how nature works and why it exhibits certain characteristics. They are supported by evidence from multiple sources and may contain one or several laws. For example, the theory of evolution is a well-established theory that explains the process of species' development over time.
A scientific law is a descriptive generalization about how some aspect of the natural world behaves under specific circumstances. It is a summary description of the environment based on repeated experiments or observations. Laws are narrower in scope than theories and do not explain the underlying mechanisms or causes of phenomena. Instead, they are empirical conclusions or distillations of the results of repeated observations. Laws are often formulated as mathematical statements or equations and are used to predict the outcomes of experiments or the behaviour of the natural world. For example, Newton's Law of Universal Gravitation describes the relationship between the masses of two objects and the distance between them, but it does not explain why this relationship exists.
In summary, scientific facts are simple observations, scientific theories provide overarching explanations, and scientific laws describe the behaviour of natural phenomena under specific conditions without explaining the underlying causes.
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Scientific laws are flexible
The word "law" is used differently in everyday life and in science. In everyday usage, a law is often seen as something absolute. However, scientific laws are flexible and open to change. They can have exceptions, be proven wrong, or evolve over time as new information comes to light. For instance, Mendel's laws were universally accepted until a century later when scientists discovered DNA and chromosomes, providing a new biochemical explanation.
Scientific laws are generalised observations about the relationship between two or more things in the natural world. They are based on empirical evidence and are often expressed as mathematical statements or equations. For example, Newton's Law of Universal Gravitation can be written as an equation: Fg = G * (m1 * m2) / d^2, where 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.
The flexibility of scientific laws is evident in their ability to be contradicted, restricted, or extended by future observations. They are not absolute truths but rather reflect the current understanding of the natural world based on repeated observations and experiments. For instance, Ohm's law applies only to linear networks, and Newton's law of universal gravitation is valid only in weak gravitational fields.
Scientific laws are also flexible in that they can be revised or replaced in light of new and unexpected information. While laws are generally resistant to change, they are not set in stone. As scientific knowledge advances, laws can be modified or updated to incorporate new discoveries or understandings.
Furthermore, the applicability of a scientific law is limited to the circumstances under which it was observed. Extrapolating beyond these circumstances may lead to inaccurate predictions or conclusions. Thus, scientific laws are flexible in that their applicability is context-dependent and subject to the specific conditions under which they were derived.
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Scientific laws vs. theories
A scientific law predicts the results of certain initial conditions. It might predict your unborn child's possible hair colour or how far a baseball travels when launched at a certain angle. Laws are generalised observations about a relationship between two or more things in the natural world based on a variety of facts and empirical evidence, often framed as a mathematical statement. For example, Newton's Law of Universal Gravitation describes the attractive forces between all forms of matter.
A theory, on the other hand, 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 typically more expansive, and they focus on the how and why of natural phenomena.
Both scientific laws and theories are considered scientific facts. However, theories and laws can be disproven when new evidence emerges. Certain accepted truths of Newtonian physics were partially disproven by Albert Einstein's theory of relativity. The work of Louis Pasteur disproved prior theories of disease in animals.
A theory is a well-supported explanation of observations. A scientific law is a statement that summarizes the relationship between variables. Theories are not likely to change. Scientific laws are similar to scientific theories in that they are principles that can be used to predict the behaviour of the natural world. Both scientific laws and scientific theories are typically well-supported by observations and/or experimental evidence. Usually, scientific laws refer to rules for how nature will behave under certain conditions, frequently written as an equation.
Scientific theories are more overarching explanations of how nature works and why it exhibits certain characteristics. As a comparison, theories explain why we observe what we do and laws describe what happens. A scientific law may be contradicted, restricted, or extended by future observations. A law can often be formulated as one or several statements or equations, so that it can predict the outcome of an experiment.
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Scientific laws vs. hypotheses
In the scientific context, the terms "law", "hypothesis", "theory", and "fact" have distinct meanings, even though they are often used interchangeably in everyday life.
A scientific law is a statement that summarizes the relationship between variables. It predicts the results of certain initial conditions, often framed as a mathematical statement or equation. For example, Newton's Law of Universal Gravitation states that the force of gravity between two objects depends on the masses of the objects and the distance between them. However, a scientific law does not explain why the phenomenon exists or what causes it. It also does not express absolute certainty and may be proven wrong or evolve over time.
A hypothesis, on the other hand, is a tentative explanation or a guessed outcome of a particular experiment that can be tested by further investigation. It is a suggested solution or an educated guess based on observations. For example, the statement "there is a supermassive black hole at the center of our galaxy" was a good hypothesis because it was testable, reasonably likely to be true based on previous observations, and led to groundbreaking results when proven true.
While a hypothesis can be easily changed, a scientific law is more resistant to change since it is adopted only if it fits the data. However, laws are not set in stone and can be revised in light of new and unexpected information.
In summary, a hypothesis is a tentative explanation or prediction that is testable, while a scientific law is a more established relationship between variables that is supported by a wide range of data and has strong predictive powers.
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Scientific laws vs. principles
In science, the terms "principle", "law", "theory", and "hypothesis" all have distinct meanings, although they are often used interchangeably in everyday life. The exact definitions of these terms can vary slightly between different fields of science.
A scientific law is a statement that summarizes the relationship between variables. It is a specific statement based on empirical data, and its accuracy is generally confined to a certain set of conditions. For example, Newton's Law of Universal Gravitation states that the force of gravity between two objects depends on the masses of the objects and the distance between them. A scientific law can often be reduced to a mathematical statement or equation, such as E = mc².
A principle is usually broader than a law. While a law can be written as a single equation, a principle is typically expressed using conceptual statements and can become several different equations when applied to different parameters. For instance, Heisenberg's uncertainty principle becomes a certain equation when applied to the position-momentum pair of parameters but becomes a different equation with the same form when applied to the energy-lifetime pair of parameters. Bernoulli's principle in fluid dynamics, for example, could be called Bernoulli's law.
A scientific theory, on the other hand, is a collection of laws, principles, concepts, and facts united into a self-consistent framework that has been verified experimentally. It provides a comprehensive explanation of an important feature of nature supported by facts gathered through observation and experimentation. Theories also allow scientists to make predictions about unobserved phenomena. For example, Einstein's Special Relativity explains the relationship between space and time for objects moving at a consistent speed in a straight line.
Hypotheses and postulates are not laws or theories because they have not been verified to the same degree, although they may lead to the formulation of laws and theories. A hypothesis is a guessed outcome of an experiment, observation, data analysis, simulation, or mathematical derivation that has not yet been tested.
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Frequently asked questions
A law is a rule that is enforced by a governing body and is binding.
A scientific law is a statement that summarizes the relationship between variables. It is discovered rather than invented and is based on repeated observations and experiments.
A law is a rule enforced by a governing body, whereas a scientific law is a statement that describes the behavior of nature under certain conditions.
Yes, a scientific law is flexible and can be proven wrong or evolve over time as new research and observations are made.
