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• pi
Pi is symbolized π and pronounced like "pie." It is the mathematical symbol for the number 3.14159…, which goes on(...) - Read More
• ## o

• 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 matter
Scientists call the everyday matter of our world, such as tables and chairs, “ordinary matter.” Ordinary matter is made up(...) - Read More
• oscillation
Definition (1): An oscillation is a repetitive back-and-forth motion. A pendulum swinging back and forth is an everyday(...) - Read More
• oscillator
An oscillator is something that oscillates. Something that vibrates. See oscillation for more information.

• ## p

• particle
In 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
• period
If 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 Elements
The Periodic Table of the Elements lists all the elements, over 100 of them, in a specific sequence. This includes the(...) - Read More
• physical constant
The 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
• 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
• ## q

• QFT
See Quantum Field Theory. - Read More
• quantities of dimension one
For “quantities of dimension one,” see “dimensionless number.” - Read More
• quantum
One 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 momentum
For quantum angular momentum, see angular momentum. - Read More
• quantum decoherence
For quantum decoherence, see  decoherence. - Read More
• Quantum Field Theory
Quantum Field Theory (QFT) is the current theory of how atomic and subatomic particles behave. It is the most up-to-date(...) - Read More
• quantum number
Electrons have a few handfuls of properties. Four have been selected as the electron’s “quantum numbers.” The quantum(...) - Read More
• quantum spin