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aberration

aberration   Quick reference

A Dictionary of Physics (7 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Physics
Length:
215 words
Illustration(s):
1

1. (in optics) A defect in the image formed by a lens or curved mirror. In chromatic aberration the image

band theory

band theory   Quick reference

A Dictionary of Physics (7 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Physics
Length:
995 words
Illustration(s):
1

The theory that, in crystals, electrons fall into allowed *energy bands, between which lie forbidden bands. Although *

barometer

barometer   Quick reference

A Dictionary of Physics (7 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Physics
Length:
390 words
Illustration(s):
1

A device for measuring *atmospheric pressure. The mercury barometer in its simplest form consists of a glass tube

Beckmann thermometer

Beckmann thermometer   Quick reference

A Dictionary of Physics (7 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Physics
Length:
99 words
Illustration(s):
1

A thermometer for measuring small changes of temperature. It consists of a mercury-in-glass thermometer with a scale covering only 5

big-bang theory

big-bang theory   Quick reference

A Dictionary of Physics (7 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Physics
Length:
946 words
Illustration(s):
1

Newton’s work gave a mathematical basis for the universe on a large scale. However, the data available at the time

Carnot cycle

Carnot cycle   Quick reference

A Dictionary of Physics (7 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Physics
Length:
168 words
Illustration(s):
1

The most efficient cycle of operations for a reversible *heat engine. Published in 1824 by N. L. S.

Cartesian coordinates

Cartesian coordinates   Quick reference

A Dictionary of Physics (7 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Physics
Length:
197 words
Illustration(s):
1

A system used in analytical geometry to locate a point P, with reference to two or three axes (see

cathode-ray tube

cathode-ray tube   Quick reference

A Dictionary of Physics (7 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Physics
Length:
267 words
Illustration(s):
1

The device that provides the viewing screen in the television tube, the radar viewer, and the *cathode-ray oscilloscope.

celestial sphere

celestial sphere   Quick reference

A Dictionary of Physics (7 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Physics
Length:
57 words
Illustration(s):
1

The imaginary sphere of infinite radius within which celestial bodies appear to lie. The earth, and the observer, are visualized

circle

circle   Quick reference

A Dictionary of Physics (7 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Physics
Length:
85 words
Illustration(s):
1

A closed curve every point on which is a fixed distance (the radius) from a point (the centre)

complex number

complex number   Quick reference

A Dictionary of Physics (7 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Physics
Length:
127 words
Illustration(s):
1

A number that has a real part, x, and an imaginary part, iy, where i=√−1 and x

crystal defects

crystal defects   Quick reference

A Dictionary of Physics (7 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Physics
Length:
851 words
Illustration(s):
2

A crystal *lattice is formed by a repeated arrangement of atoms, ions, or molecules. Within 1 cubic centimetre of

crystal system

crystal system   Quick reference

A Dictionary of Physics (7 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Physics
Length:
114 words
Illustration(s):
1

A method of classifying crystals on the basis of their unit cell. There are seven crystal systems. If the cell

decay sequence

decay sequence   Quick reference

A Dictionary of Physics (7 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Physics
Length:
307 words
Illustration(s):
1

A plot of neutron number (N) against proton number (Z) for nuclides belonging to a particular

E

E   Quick reference

A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004
Subject:
Science and technology, Mathematics and Computer Science, Physics
Length:
162 words
Illustration(s):
1

Metric As an upper-case prefix, E, see exa-, e.g. Eg = exagram.

mathematics. As E, initial

earth’s atmosphere

earth’s atmosphere   Quick reference

A Dictionary of Physics (7 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Physics
Length:
345 words
Illustration(s):
1

The gas that surrounds the earth. The composition of dry air at sea level is: nitrogen 78.08%, oxygen 20.95%, argon

eclipse

eclipse   Quick reference

A Dictionary of Physics (7 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Physics
Length:
66 words
Illustration(s):
1

The total (total eclipse) or partial (partial eclipse) obscuring of light from a celestial body as

elasticity

elasticity   Quick reference

A Dictionary of Physics (7 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Physics
Length:
183 words
Illustration(s):
1

The property of certain materials that enables them to return to their original dimensions after an applied *stress has

Electrical Conductivity in Metals

Electrical Conductivity in Metals   Quick reference

A Dictionary of Physics (7 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Physics
Length:
737 words
Illustration(s):
1

Elementary conductivity theory is an extension of *free-electron theory, in which the electrons in a metal are treated

electric bell

electric bell   Quick reference

A Dictionary of Physics (7 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Physics
Length:
88 words
Illustration(s):
1

A device in which an electromagnetically operated hammer strikes a bell. Pressing the bell-push closes a circuit, causing current to

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