Magnetic Force

This is the force that exists between two magnetic poles. It is related to the electric force and occurs when electric charges move around or with  a material with magnetic properties, such as lodestone or a magnet.

Mass

The amount of matter in an object. Mass is not the same as size. Objects with more matter will have a greater mass. Objects with more mass will weigh more, but weight changes depending on the gravitational force.

Matter

The stuff that everything is made of. click to enlarge.

Meter

A unit of length in the metric system equal to 39.37 inches.

Meson

Fundamental particles combine in different ways to make other particles. Mesons are particles that are made of a quark (of one color) and an anti-quark (with the anti-color of the quark). Here are Ushi (up quark) and Ujana (anti-up quark) in the meson we call the pi-0 (pronounced pie-zero).

Molecule

A group of two or more atoms held together by a chemical bond, a force of electromagnetic attraction. Molecules can be made of only one element such as oxygen (O2) or multiple elements such as water (H2O).