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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 randomness
Many quantum physicists view quantum mechanics as differing from classical physics in a fundamental way—quantum mechanics is(...)  Read More
 quantum spin
See "spin."  Read More

r
 random
In classical physics, events are random only due to insufficient information. Let’s take the example of a coin toss. With an(...)  Read More
 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
 Sommerfeld's Constant
See alpha, α.  Read More
 spin
Spin is a property of subatomic and atomic particles. While spin was originally thought of as a particle twirling on its(...)  Read More
 SternGerlach device
(Also called a “SternGerlach machine.”) The SternGerlach (SG) device detects the “quantum spin” of atoms and subatomic(...)  Read More

t
 Tesla
A Tesla is a unit for measuring the strength of magnetism in any particular location. A Tesla is approximately the strength(...)  Read More
 theoretical physics
Theoretical physics is one of two branches of physics: theoretical and experimental. Like almost all other types of physics,(...)  Read More
 torque
For torque, see “moment of force.”  Read More