ab-initio calculation Quick reference
A Dictionary of Chemistry (8 ed.)
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 ...
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absolute Quick reference
A Dictionary of Chemistry (8 ed.)
absolute configuration Quick reference
A Dictionary of Chemistry (8 ed.)
A way of denoting the absolute structure of an optical isomer (see
absolute zero Quick reference
A Dictionary of Chemistry (8 ed.)
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 ...
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absorption Quick reference
A Dictionary of Chemistry (8 ed.)
absorption coefficient Quick reference
A Dictionary of Chemistry (8 ed.)
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 ...
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absorption tower Quick reference
A Dictionary of Chemistry (8 ed.)
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 ...
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ABS plastic Quick reference
A Dictionary of Chemistry (8 ed.)
Any of a class of plastics based on acrylonitrile–butadiene–styrene copolymers.
abstraction Quick reference
A Dictionary of Chemistry (8 ed.)
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 Quick reference
A Dictionary of Chemistry (8 ed.)
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 ...
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