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

r
 renormalization
Renormalization is a technique for achieving greater precision in certain physics theories.* In quantum mechanics,(...)  Read More
 rotational momentum
Rotational momentum is the same thing as “angular momentum.” It is the momentum or oomph that an object has when it rotates(...)  Read More

s
 scanning tunneling microscope
A scanning tunneling microscope (STM) is a type of electron microscope. It is much more powerful than an ordinary microscope(...)  Read More
 singularity
“Singularity” has a physics definition and a mathematical definition. Both definitions are given here. They fit together(...)  Read More