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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:
129 words
A method of calculating atomic and molecular structure directly from the first principles of quantum mechanics, without using quantities derived from experiment (such as ionization ... More
absolute

absolute   Quick reference

A Dictionary of Chemistry (7 ed.)

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

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

2. Denoting a temperature measured on an ...

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:
573 words
Illustration(s):
1

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

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:
41 words
Zero of thermodynamic *temperature (0 kelvin) and the lowest temperature theoretically attainable. It is the temperature at which the kinetic energy of atoms and molecules is minimal. It ... More
absorption

absorption   Quick reference

A Dictionary of Chemistry (7 ed.)

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

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

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 any other type of electromagnetic radiation) as ... More
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 and the absorbing liquid, often water, passes in at the top and falls down ... More
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:
12 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:
42 words
Illustration(s):
1

A chemical reaction that involves bimolecular removal of an atom or ion from a molecule. An example is the abstraction of hydrogen from methane by reaction with a radical:...

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 the earth’s crust, often expressed as a percentage. For example, the abundance ... More

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