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• ## a

• absolute constant
An absolute constant is a number that has the same value wherever it appears. Examples:

π (pi) has the value 3.14159…(...) - Read More

• absolute space
(Absolute space has recently been re-conceptualized and re-named as space that has "background-independence.")

• absolute square of a complex number
The absolute square of a complex number is calculated by multiplying it by its conjugate. (The absolute square is not the(...) - Read More
• absolute time
The concept of absolute time was a foundational concept of physics as articulated by Isaac Newton in the 1600’s. It was(...) - Read More
• acausal
“Acausal” means not having a cause. In classical physics all events are believed to have a cause; none are acausal. In(...) - Read More
• acceleration
Abbreviation: a

In physics, acceleration is speeding up, slowing down, or changing direction. Acceleration contrasts(...) - Read More

• action-at-a-distance

Action-at-a-distance is the creation of an effect without physically touching. An example is magnetism: a magnet pulls(...) - Read More

• algebraic constant
An algebraic constant is a symbol that represents an unchanging number or is simply a number in an algebra equation. The(...) - Read More
• alpha
In quantum physics, the ancient Greek letter α, alpha, represents an important constant of nature. Alpha is .00729735256…(...) - Read More
• amplitude of a wave
The amplitude of a wave is its height, that is, half the distance from trough to crest. Amplitude can be measured for water(...) - Read More
• ancient physics
Ancient physics was the physics of the ancient world, that is, of the Egyptians, Greeks, Indians (of India), and other(...) - Read More
• anomaly
An anomaly is an experimental result or an observation that doesn’t fit current scientific theories.

• antimatter
Antimatter is not just the stuff of science fiction. It is as real as ordinary matter. Physicists call the matter that we(...) - Read More
• antiparticle
An antiparticle is an antimatter version of a normal particle. For example, an antiquark is an antimatter quark. An(...) - Read More
• atom
An atom is the tiniest component of an element which shares in the element’s properties. Break down matter any further and(...) - Read More
• atomic number
The atomic number of an atom is the number of protons in its nucleus. For example, an atom of carbon has six protons and has(...) - Read More
• ## b

• B
B is the symbol that represents the strength and direction, in any particular location, of the magnetic field due to the(...) - Read More
• bare number
For “bare number,” see “dimensionless number.” - Read More
• baryon
Baryons are a category of subatomic particles in the nucleus of the atom. Protons and neutrons are examples of baryons.(...) - Read More
• ## l

• L
(Symbol is L. Also called “rotational momentum” or “moment of momentum.”) Angular momentum is the momentum or oomph which an(...) - Read More
• ## α

• α
In quantum physics, the ancient Greek letter α, alpha, represents an important constant of nature. Alpha is .00729735256…(...) - Read More
• angular momentum
(Symbol is L. Also called “rotational momentum” or “moment of momentum.”) Angular momentum is the momentum or oomph which an(...) - Read More