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ab-initio calculation

ab-initio calculation   Quick reference

A Dictionary of Chemistry (7 ed.)

Reference type:
Subject Reference
Current Version:
2016
Subject:
Science and technology, Chemistry
Length:
128 words

A method of calculating atomic and molecular structure directly from the first principles of quantum mechanics, without using quantities derived

absolute

absolute   Quick reference

A Dictionary of Chemistry (7 ed.)

Reference type:
Subject Reference
Current Version:
2016
Subject:
Science and technology, Chemistry
Length:
78 words

1. Not dependent on or relative to anything else, e.g. *absolute zero.

2. Denoting a temperature measured on

absolute configuration

absolute configuration   Quick reference

A Dictionary of Chemistry (7 ed.)

Reference type:
Subject Reference
Current Version:
2016
Subject:
Science and technology, Chemistry
Length:
521 words
Illustration(s):
1

A way of denoting the absolute structure of an optical isomer (see optical activity). Two conventions are in

absolute zero

absolute zero   Quick reference

A Dictionary of Chemistry (7 ed.)

Reference type:
Subject Reference
Current Version:
2016
Subject:
Science and technology, Chemistry
Length:
40 words

Zero of thermodynamic *temperature (0 kelvin) and the lowest temperature theoretically attainable. It is the temperature at which the

absorption

absorption   Quick reference

A Dictionary of Chemistry (7 ed.)

Reference type:
Subject Reference
Current Version:
2016
Subject:
Science and technology, Chemistry
Length:
115 words

1. (in chemistry) The take up of a gas by a solid or liquid, or the take up of a

absorption coefficient

absorption coefficient   Quick reference

A Dictionary of Chemistry (7 ed.)

Reference type:
Subject Reference
Current Version:
2016
Subject:
Science and technology, Chemistry
Length:
150 words

1. (in spectroscopy) The molar absorption coefficient (symbol ϵ) is a quantity that characterizes the absorption of light (or

absorption tower

absorption tower   Quick reference

A Dictionary of Chemistry (7 ed.)

Reference type:
Subject Reference
Current Version:
2016
Subject:
Science and technology, Chemistry
Length:
48 words

A long vertical column used in industry for absorbing gases. The gas is introduced at the bottom of the column

ABS plastic

ABS plastic   Quick reference

A Dictionary of Chemistry (7 ed.)

Reference type:
Subject Reference
Current Version:
2016
Subject:
Science and technology, Chemistry
Length:
14 words

Any of a class of plastics based on acrylonitrile–butadiene–styrene copolymers.

abstraction

abstraction   Quick reference

A Dictionary of Chemistry (7 ed.)

Reference type:
Subject Reference
Current Version:
2016
Subject:
Science and technology, Chemistry
Length:
43 words

A chemical reaction that involves bimolecular removal of an atom or ion from a molecule. An example is the abstraction

abundance

abundance   Quick reference

A Dictionary of Chemistry (7 ed.)

Reference type:
Subject Reference
Current Version:
2016
Subject:
Science and technology, Chemistry
Length:
102 words

1. The ratio of the total mass of a specified element in the earth’s crust to the total mass of

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