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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

m
 mathematical constant
Pi and e are examples of mathematical constants. A mathematical constant has the same value no matter which mathematical(...)  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
 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

p
 p
(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