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d
 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
 dynamic system
A dynamic system is a system that changes over time. It can also be called a "dynamical system." While some maintain that(...)  Read More
 dynamical system
See dynamic system.  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
 Free Will Theorem
Do quantum particles have free will? Can they make choices? Some physicists have considered this question seriously. But(...)  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
 frequency and wavelength
Frequency and wavelength are both properties of waves. They are closely related, so this article discusses the two(...)  Read More
 function
The term “function” is important in the field of quantum mechanics because is it the basis of the key term “wave function.”(...)  Read More

g
 Guiding Wave Interpretation of quantum mechanics
The Guiding Wave Interpretation of quantum mechanics is also called the "Bohmian Interpretation" as David Bohm was one of(...)  Read More

h
 Heisenberg Uncertainty Principle (HUP)
[This article is under construction.]
The Heisenberg Uncertainty Principle (HUP) says that atoms and the components of(...)  Read More

i
 i
The letter i is the symbol for the square root of 1. In other words i = √1. The symbol i often appears in the equations of(...)  Read More
 imaginary number
An imaginary number is one that includes the square root of 1, written √(1). While one might think that such a number(...)  Read More
 ion
An ion is formed when an atom gains or loses an electron. An atom which has lost one or more electrons has a positive(...)  Read More
 ionize
To ionize is to convert a substance from atomic or molecular form to ions.
An ion is a type of atom that has an imbalance(...)  Read More
 isotope
Isotopes are a special kind of atom. Atoms with the same number of protons but different numbers of neutrons are isotopes of(...)  Read More

j
 Joule
A Joule is a unit for measuring energy. It's the amount of energy needed to lift a medium tomato one meter off the surface(...)  Read More