Index

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

X

Y

Z

 

E

E=mc2
Einstein's famous theory of relativity formula known as the energy mass relation. The energy e is equal to the mass m multiplied by the speed of light squared c2. A small mass produces an enormous amount of energy.
Eccentric
Non circular; elliptical (applied to an orbit).
Eccentricity
A value that defines the shape of an ellipse or planetary orbit; the ratio of the distance between the foci and the major axis.
Eclipse
The cutting off of light from one celestial body by another.
Ecliptic
The plane of Earth's orbit about the Sun
Effusive Eruption
A relative quiet volcanic eruption which puts out basaltic lava that moves at about the speed one walks. The lava is fluid in nature. The eruptions at the Kilauea volcano on the island of Hawaii are effusive
Ejecta
Material such as glass and fragmented rock thrown out of an impact crater during its formation.
Ellipse
A closed curve that is formed from two foci or points in which the sum of the distances from any point on the curve to the two foci is a constant. Johannes Kepler first discovered that the orbits of the planets are ellipses, not circles; he based his discovery on the careful observations of Tycho Brahe.
Elliptical Time
A time span with no beginning or ending.
En Echelon Fissures
Fissures that are parallel in trend to each other, but offset to either the left or right.
Energy System
A term used to describe the auric field.
Entity
The entity model of consciousness encompasses the individuated spirit sometimes referred to as the Higher Self or Soul.
Eolian
Related to wind deposits and associated effects.
Eruption
The ejection of volcanic materials (lavas, pyroclasts and volcanic gases) onto the surface, either from a central vent, a fissure or a group of fissures.
Explosive Eruption
A dramatic volcanic eruption which throws debris high into the air for hundreds of miles. The lava is low in silicate and can be very dangerous for people near by. An example is Mount St. Helens in 1980.

Electron
An electron is a negatively charged subatomic particle. It can be either free (not attached to any atom), or bound to the nucleus of an atom. Electrons in atoms exist in spherical shells of various radii, representing energy levels. The larger the spherical shell, the higher the energy contained in the electron.

In electrical conductors, current flow results from the movement of electrons from atom to atom individually, and from negative to positive electric poles in general. In semiconductor materials, current also occurs as a movement of electrons. But in some cases, it is more illustrative to envision the current as a movement of electron deficiencies from atom to atom. An electron-deficient atom in a semiconductor is called a hole. Holes "move" from positive to negative electric poles in general.

The charge on a single electron is considered as the unit electrical charge. It is assigned negative polarity. The charge on an electron is equal, but opposite, to the positive charge on a proton or hole. Electrical charge quantity is not usually measured in terms of the charge on a single electron, because this is an extremely small charge. Instead, the standard unit of electrical charge quantity is the coulomb, symbolized by C, representing about 6.24 x 1018 electrons. The electron charge, symbolized by e, is about 1.60 x 10-19 C. The mass of an electron at rest, symbolized me, is approximately 9.11 x 10-31 kilogram (kg). Electrons moving at an appreciable fraction of the speed of light, for example in a particle accelerator, have greater mass because of relativistic effects.

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