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• ### o

• open sytemSee system. Read More
• operatorIn mathematics, “operator” has two main definitions. 1) An operator is a mathematical symbol, for example +, that represents(...) Read More
• orbitalIn the early 1900's, when physicists were first probing the insides of the atom, they thought that electrons might travel(...) Read More
• orbital angular momentum(Symbol: ɭ or L). Electrons have two types of rotational motion: orbital angular momentum and spin. Orbital angular momentum(...) Read More
• ordinary matterScientists call the everyday matter of our world, such as tables and chairs, “ordinary matter.” Ordinary matter is made up(...) Read More
• oscillationDefinition (1): An oscillation is a repetitive back-and-forth motion. A pendulum swinging back and forth is an everyday(...) Read More
• oscillatorAn oscillator is something that oscillates. Something that vibrates. See oscillation for more information. [caption(...) Read More
• ### p

• particleIn everyday speech, a particle is a bit of matter. I might say that there is particle of dirt on the lens of my glasses.(...) Read More
• particle-wave dualityWhen a photon hits your eye, it’s a particle. When it hits your eye, it interacts with a particular electron in the retina(...) Read More
• periodIf you were standing on a dock and water waves were coming at you, the period would be the time interval between waves. In(...) Read More
• Periodic Table of the ElementsThe Periodic Table of the Elements lists all the elements, over 100 of them, in a specific sequence. This includes the(...) Read More
• physical constantThe constant c, the speed of light in a vacuum, is an example of a physical constant. It is a constant of nature, always(...) Read More
• piPi is symbolized π and pronounced like "pie." It is the mathematical symbol for the number 3.14159…, which goes on(...) Read More
• Pilot Wave Interpretation of quantum mechanicsThis interpretation of quantum mechanics is also called the "Bohmian Interpretation." It was originally proposed by(...) Read More
• probability amplitude“Probability amplitude” is a term used in quantum physics. It’s a number that appears in Schrodinger’s Wave Equation. Let’s(...) Read More
• probability waveMax Born, one of the early quantum physicists in the 1920's and '30s, proposed that between detections, quantum particles(...) Read More
• ### q

• QFTSee Quantum Field Theory. Read More
• QFTQuantum Field Theory (QFT) is the current theory of how atomic and subatomic particles behave. It is the most up-to-date(...) Read More
• quantities of dimension oneFor “quantities of dimension one,” see “dimensionless number.” Read More
• quantumOne definition of “quantum” is: a tiny packet of energy at the atomic level. A quantum is the smallest possible unit of(...) Read More
• quantum angular momentumFor quantum angular momentum, see angular momentum. Read More
• quantum decoherenceFor quantum decoherence, see  decoherence. Read More
• quantum entanglementIn quantum physics, if two particles are entangled, their behavior is correlated. In addition, if a physicist obtains(...) Read More
• Quantum Field TheoryQuantum Field Theory (QFT) is the current theory of how atomic and subatomic particles behave. It is the most up-to-date(...) Read More
• QuantumlandSee quantum realm. Read More
• quantum mechanicsIn quantum mechanics, physicists study how tiny particles behave. These include atoms, the components of atoms like(...) Read More
• quantum numberElectrons have a few handfuls of properties. Four have been selected as the electron’s “quantum numbers.” The quantum(...) Read More
• quantum physicsFor an understanding of quantum physics, see the definition of "quantum mechanics." Often, the two terms are used to mean(...) Read More
• quantum randomnessMany quantum physicists view quantum mechanics as differing from classical physics in a fundamental way—quantum mechanics is(...) Read More
• quantum realmA number of interpretations of quantum mechanics postulate a “quantum realm.” These include the Transactional(...) Read More