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m
 Measurement Problem
Understanding the Measurement Problem requires understanding the unique role of measurement in quantum mechanics. The entry(...)  Read More
 metal
A metal is a kind of matter, usually derived from rocks found in nature. Examples of metals include iron, aluminum, and(...)  Read More
 minimal theory
A minimal theory in physics is a theory that accounts for known phenomena with the simplest approach conceivable. Of course,(...)  Read More
 moment
“Moment,” as used in physics, means the amount of force experienced by an object due to the amount of force applied at a(...)  Read More
 moment of force
Moment of force is also called torque. “Moment,” as used in physics, means the amount of force experienced by an object due(...)  Read More
 moment of momentum
In classical physics, moment of momentum is the momentum or oomph which an object has as it rotates about an axis. It is the(...)  Read More
 momentum
(Abbreviated p. Momentum is the oomph something has due to having mass that’s in motion. Let’s say you just happen to be(...)  Read More

n
 normal matter
Scientists call the everyday matter of our world, such as tables and chairs, “normal matter.” Normal matter is made up of(...)  Read More

o
 operator
In mathematics, “operator” has two main definitions. 1) An operator is a mathematical symbol, for example +, that represents(...)  Read More
 orbital angular momentum
(Symbol: ɭ or L). Electrons have two types of rotational motion: orbital angular momentum and spin. Orbital angular momentum(...)  Read More
 ordinary matter
Scientists call the everyday matter of our world, such as tables and chairs, “ordinary matter.” Ordinary matter is made up(...)  Read More
 oscillation
Definition (1): An oscillation is a repetitive backandforth motion. A pendulum swinging back and forth is an everyday(...)  Read More
 oscillator
An oscillator is something that oscillates. Something that vibrates. See oscillation for more information.
[caption(...)  Read More

p
 particle
In everyday speech, a particle is a bit of matter. I might say that there is particle of dirt on the lens of my glasses.(...)  Read More
 particlewave duality
When a photon hits your eye, it’s a particle. When it hits your eye, it interacts with a particular electron in the retina(...)  Read More
 period
If you were standing on a dock and water waves were coming at you, the period would be the time interval between waves. In(...)  Read More
 Periodic Table of the Elements
The Periodic Table of the Elements lists all the elements, over 100 of them, in a specific sequence. This includes the(...)  Read More
 physical constant
The constant c, the speed of light in a vacuum, is an example of a physical constant. It is a constant of nature, always(...)  Read More
 pi
Pi is symbolized π and pronounced like "pie." It is the mathematical symbol for the number 3.14159…, which goes on(...)  Read More
 probability amplitude
“Probability amplitude” is a term used in quantum physics. It’s a number that appears in Schrodinger’s Wave Equation. Let’s(...)  Read More