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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
Even though it’s now considered obsolete, Niels Bohr took a huge step forward in quantum physics, when in 1913, he proposed(...) - Read More
• ## c

• 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 well-known 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:

• 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
• 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

• 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
• 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
• experimental physics
For experimental physics, see  theoretical physics. - Read More
• ## f

• fine-structure constant
See alpha, α. - Read More
• fine-structure constant
See alpha, , α.  - Read More
• frequency
Frequency is the number of repeated motions in a period of time. These motions can be up and down, like a hammer, or back(...) - Read More
• ## q

• decoherence
(Also called “quantum decoherence.”) Decoherence occurs when a quantum particle loses its coherence. So, what is coherence?(...) - Read More