Physics Principles
Physics Principles - Related Videos
01:16
Physical Principles Governing Gas Exchange
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2024
Gas behavior plays a vital role in understanding bodily processes such as external and internal respiration. External respiration involves the diffusion of oxygen into the blood and carbon dioxide out of it in the lungs. In contrast, internal respiration happens in body tissues, where these gases move in opposite directions. Gas Laws Governing Respiration The behavior of gases is guided by Dalton's Law of partial pressures and Henry's Law. Dalton's Law asserts that the total pressure exerted by...
04:08
The Uncertainty Principle
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2020
Werner Heisenberg considered the limits of how accurately one can measure properties of an electron or other microscopic particles. He determined that there is a fundamental limit to how accurately one can measure both a particle’s position and its momentum simultaneously. The more accurate the measurement of the momentum of a particle is known, the less accurate the position at that time is known and vice versa. This is what is now called the Heisenberg uncertainty principle. He mathematically...
08:37
Le Châtelier's Principle
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2023
Source: Laboratory of Dr. Lynne O'Connell — Boston College When the conditions of a system at equilibrium are altered, the system responds in such a way as to maintain the equilibrium. In 1888, Henri-Lewis Le Châtelier described this phenomenon in a principle that states, "When a change in temperature, pressure, or concentration disturbs a system in chemical equilibrium, the change will be counteracted by an alteration in the equilibrium composition." This experiment demonstrates Le Châtelier's...
01:49
Hardy-Weinberg Principle
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2026
Diploid organisms have two alleles of each gene, one from each parent, in their somatic cells. Therefore, each individual contributes two alleles to the gene pool of the population. The gene pool of a population is the sum of every allele of all genes within that population and has some degree of variation. Genetic variation is typically expressed as a relative frequency, which is the percentage of the total population that has a given allele, genotype or phenotype.In the early 20th century,...
03:06
The Pauli Exclusion Principle
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2020
The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information: The number of the principal quantum shell, n, The letter that designates the orbital type (the subshell, l), and A superscript number that designates the number of electrons in that particular subshell. For example, the notation 2p4 indicates four electrons in a p subshell (l = 1) with a principal...
FAQs
Physics principles connect measurable quantities through mathematical models, allowing researchers to represent relationships among motion, forces, energy, matter, space, and time. A model can be compared with observations, adjusted when necessary, and used to generate predictions for new conditions. This quantitative cycle links theoretical explanations with experiments and provides a basis for evaluating whether a proposed description of nature is supported.
Conservation of energy and momentum provides a way to track how physical quantities change within a system. Instead of examining every detail independently, researchers can compare the initial and final states and determine whether the overall accounting is consistent. These principles support calculations involving motion and interactions, while also helping identify whether an experimental result agrees with an accepted physical model.
The framework includes both classical principles, such as Newton’s laws, and quantum mechanics, which addresses physical behavior at a different conceptual scale. Their inclusion shows that physics uses multiple models rather than one universal description applied identically to every problem. Selecting an appropriate principle helps researchers explain observations and make predictions that fit the system being studied.
A typical approach begins by identifying measurable quantities and expressing their relationships with a physical model. Researchers then design observations or measurements that can test the model’s predictions, compare results with the expected behavior, and refine the explanation if discrepancies appear. This procedure makes experimental design more systematic and links evidence to quantitative reasoning rather than relying only on qualitative description.
Applying these principles can produce explanations for observed behavior, quantitative predictions, and models that can be tested under new conditions. The results may reveal how forces affect motion, how energy is transferred, or how physical systems behave through thermodynamic and electromagnetic relationships. Such outcomes support both basic research and the development of practical technologies based on measured behavior.
Their applications extend to structures, machines, electronic devices, medical technologies, biological systems, and the study of the universe. In engineering, they guide design and innovation; in medicine, they contribute to technological development; and in biology, they help interpret physical aspects of living systems. Across these areas, the same quantitative framework connects measurable behavior with practical decisions and research questions.