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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

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

l
 Law of Conservation of Energy
The Law of Conservation of Energy says that the amount of energy in an isolated system remains constant. Energy cannot be(...)  Read More
 Law of 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
 linear momentum
Linear momentum is the oomph something has due to having mass that’s in motion. If a football player were to ram into a(...)  Read More
 lines of force
“Lines of force” can best be explained with an illustration. The photo shows the lines of magnetic force created with a(...)  Read More
 local realism
[This article is under construction.]
Local realism is the principle that: 1) The cause of a physical change must be(...)  Read More
 logical
Logical reasoning is reasoning that draws conclusions based on correct understanding of relationships. Here are examples of(...)  Read More

m
 magnetic moment
The magnetic moment is the strength of the response of a piece of metal to a magnetic field. It is a measure of the degree(...)  Read More
 magnetic moment of the electron
The magnetic moment of an electron is symbolized as g and is called the “gfactor.”
The magnetic moment is the degree to(...)  Read More
 mathematical constant
Pi and e are examples of mathematical constants. A mathematical constant has the same value no matter which mathematical(...)  Read More