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o
 open sytem
See system.  Read More
 operator
In mathematics, “operator” has two main definitions. 1) An operator is a mathematical symbol, for example +, that represents(...)  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 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 backandforth 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.
[caption(...)  Read More

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
 particlewave duality
When 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
 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
 pi
Pi 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 mechanics
This 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

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 entanglement
In quantum physics, if two particles are entangled, their behavior is correlated. In addition, if a physicist obtains(...)  Read More