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• i
• 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
• indeterminacy
“Indeterminacy” or “quantum indeterminacy” refers to the uncertainty of results when measuring certain pairs of properties(...) Read More
• Indeterminacy Principle
The “Indeterminacy Principle” is another name for the Heisenberg Uncertainty Principle (HUP). See the Heisenberg Uncertainty(...) Read More
• interpretation of quantum mechanics
An interpretation of quantum mechanics describes the nature of reality in the quantum realm. Quantum mechanics is a set of(...) 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

Local realism is a quick way of saying two principles: 1) Principle of locality:(...) Read More

• locality
In everyday life, we assume the principle of locality. Here’s the principle of locality: Causing an effect on an object or(...) 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 “g-factor.”

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
• measurement in quantum mechanics
(Also called “observation”). Measurement is of considerable consequence in the quantum world. At least in some(...) Read More
• Measurement Problem
Understanding the Measurement Problem requires understanding the unique role of measurement in quantum mechanics. The entry(...) Read More