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### c

- conjugate pairsConjugate pairs are pairs of properties to which the Heisenberg Uncertainty Principle applies. Conjugate pairs are also(...) Read More
- conservation lawsPhysics includes several conservation laws. The most well-known is the Law of Conservation of Energy. This law states that(...) Read More
- conservation of energyThe Law of Conservation of Energy says that in our universe the amount of energy remains constant. Energy cannot be created(...) Read More
- conservation of matterThe Law of Conservation of Matter was abandoned as inaccurate by physicists early in the 1900’s. For more information, see(...) Read More
- conserved quantityA conserved quantity is something that remains constant in amount over time and cannot be created nor destroyed. Conserved(...) Read More
- constant A constant is a number or symbol that always has the same value. There are four types of constants: A mathematical(...) Read More
- constant of natureA constant of nature is another way of saying a "physical constant." Read More
- Copenhagen InterpretationThe Copenhagen Interpretation of quantum mechanics is the original attempt by physicists to provide an explanation for the(...) Read More
- Coulomb's LawCoulomb’s Law is a formula that allows us to calculate the electric force generated between two electrical charges.(...) Read More
### d

- dark energyDark energy is the name given to an unexplained aspect of the universe. Dark energy has been postulated as an explanation(...) Read More
- dark matter"Dark matter" is a name that’s been given to a substance which many scientists believe may exist. If it exists, this(...) Read More
- de Broglie-Bohm interpretation of quantum mechanicsThis interpretation of quantum mechanics is also called the "Bohmian Interpretation." It was originally proposed by(...) Read More
- decoherence(Also called "quantum decoherence.”) Decoherence occurs when a quantum particle loses(...) Read More
- dimensionless numberPi is an example of a dimensionless number. A dimensionless number doesn’t imply any measurement units. Pi is just 3.14, not(...) Read More
- dynamical systemSee dynamic system. Read More
- dynamic systemA dynamic system is a system that changes over time. It can also be called a "dynamical system." While some maintain that(...) Read More
### e

- ee is the symbol for Euler's number. Similarly to pi, e is a constant which occurs repeatedly throughout nature. It has a(...) Read More
- Euler's number (e)Euler's number, similarly to pi, is a constant which occurs repeatedly throughout nature. It is symbolized as e. It has a(...) Read More
- experimental physicsFor experimental physics, see theoretical physics. Read More
### f

- fine-structure constantSee alpha, α. Read More
- fine-structure constantSee alpha, , α. Read More
- Free Will TheoremDo quantum particles have free will? Can they make choices? Some physicists have considered this question seriously. But(...) Read More
- frequencyFrequency is the number of repeated motions in a period of time. These motions can be up and down, like a hammer, or back(...) Read More
- frequency and wavelengthFrequency and wavelength are both properties of waves. They are closely related, so this article discusses the two(...) Read More
- functionThe term “function” is important in the field of quantum mechanics because is it the basis of the key term “wave function.”(...) Read More
### g

- Guiding Wave Interpretation of quantum mechanicsThe Guiding Wave Interpretation of quantum mechanics is also called the "Bohmian Interpretation" as David Bohm was one of(...) Read More
### h

- Heisenberg Uncertainty Principle (HUP)The Heisenberg Uncertainty Principle (HUP) is also called the “Indeterminacy Principle” or simply, the "Uncertainty(...) Read More
- HUP“HUP” stands for the Heisenberg Uncertainty Principle, which see. Read More
### i

- iThe letter i is the symbol for the square root of -1. In other words i = √-1. The symbol i often appears in the equations of(...) Read More
- idealismIn ordinary English, "idealism" is contrasted with pragmatism. "Idealism" refers to the prioritizing of ideals. The meaning(...) Read More