empirical formulae

empirical formula

noun Chemistry.
a chemical formula indicating the elements of a compound and their relative proportions, as (CH 2 O) n .


Origin:
1820–30

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World English Dictionary
empirical formula
 
n
1.  molecular formula Compare structural formula a chemical formula indicating the proportion of each element present in a molecule: C6H12O6 is the molecular formula of sucrose whereas CH2O is its empirical formula
2.  a formula or expression obtained from experimental data rather than theory

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

empirical formula n.
A chemical formula that indicates the relative proportions of the elements in a molecule rather than the actual number of atoms of the elements.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
empirical formula  
A chemical formula that indicates the relative proportions of the elements in a molecule rather than the actual number of atoms of the elements. The empirical formula of a compound may be simpler than its molecular formula, which is a multiple of the empirical formula. For example, glucose has the molecular formula C6H12O6 but the empirical formula CH2O. Compare molecular formula, structural formula.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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