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b
 baryonic matter
All the matter that we ordinarily deal with in everyday life is baryonic matter. Baryonic matter is composed of atoms which(...)  Read More
 Bohr atom
[Animation by Kurzonddddd (Own work); CC BYSA 3.0(...)  Read More

c
 collapse of the wave function
Collapse of the wave function is the transformation from a spreadout wave function to a localized particle. To understand(...)  Read More
 collapse of the wavefunction
See article collapse of the wave function.
 complex number
This is an example of a complex number: 3 + 4i. It means take 3 and add 4 times i. The letter i is the symbol for the square(...)  Read More
 conservation laws
Physics includes several conservation laws. The most wellknown is the Law of Conservation of Energy. This law states that(...)  Read More
 conservation of energy
The Law of Conservation of Energy says that in our universe the amount of energy remains constant. Energy cannot be created(...)  Read More
 conservation of matter
The Law of Conservation of Matter was abandoned as inaccurate by physicists early in the 1900’s. For more information, see(...)  Read More
 conserved quantity
A conserved quantity is something that remains constant in amount over time and cannot be created nor destroyed. Conserved(...)  Read More
 constant
A constant is a number or symbol that always has the same value. There are four types of constants:
A mathematical(...)  Read More
 constant of nature
A constant of nature is another way of saying a "physical constant."  Read More
 Coulomb's Law
Coulomb’s Law is a formula that allows us to calculate the electric force generated between two electrical charges.(...)  Read More

d
 dark energy
Dark energy is the name given to an unexplained aspect of the universe. Dark energy has been postulated as an explanation(...)  Read More
 dark matter
"Dark matter" is a name that’s been given to a substance which many scientists believe may exist. If it exists, this(...)  Read More
 decoherence
(Also called "quantum decoherence.”) Decoherence occurs when a quantum particle loses(...)  Read More
 dimensionless number
Pi is an example of a dimensionless number. A dimensionless number doesn’t imply any measurement units. Pi is just 3.14, not(...)  Read More

e
 e
e is the symbol for Euler's number. Similarly to pi, e is a constant which occurs repeatedly throughout nature. It has a(...)  Read More
 Euler's number (e)
Euler's number, similarly to pi, is a constant which occurs repeatedly throughout nature. It is symbolized as e. It has a(...)  Read More
 experimental physics
For experimental physics, see theoretical physics.  Read More

f
 finestructure constant
See alpha, α.  Read More