Where does compound collide?

A pure substance formed when atoms of two or more different elements are chemically bonded together in a fixed, whole-number ratio, so its composition is the same throughout: water, for instance, is always two parts hydrogen to one part oxygen. Dalton's 1808 A New System of Chemical Philosophy set out the atomic account of how elements combine in simple fixed proportions to form compounds, marking them off from mere mixtures, whose parts vary and can be pulled apart by physical means. The referent is a bonded chemical substance with a fixed formula, not a growth rule for money, a word built from smaller words, or a many-unit eye.[1]

Unit

One chemical substance, given by its fixed formula and the elements bonded in it

Recovery means

A compound can be split back into its elements only by a chemical reaction, not by physical separation

Measured by

Identified by its constant composition and fixed mass ratios, and by analysis such as spectroscopy or mass spectrometry

A way of reckoning growth in which interest is charged or earned not only on the original principal but also on the interest already built up in earlier periods, so the balance grows faster and faster over time. Lewin's 1981 Compound interest in the seventeenth century traced how the practice was formalised and tabulated, and how it parts from simple interest, which is paid only on the starting principal. The referent is a rule for the accelerating growth of a money balance, not a bonded chemical substance, a joined word, or a multi-unit eye.[2]

Unit

A balance that grows each period by a rate applied to principal plus accumulated interest

Recovery means

Not applicable

Measured by

Computed from the principal, the periodic rate, and the number of compounding periods, and often reported as an effective annual rate

A word formed by combining two or more existing words or word-building roots into a single new word, such as blackbird or toothbrush, whose meaning is often more than the sum of its parts. Lieber and Štekauer's 2011 The Oxford Handbook of Compounding surveyed compounding as a word-formation process across the world's languages and set out how compounds are told apart from phrases, classified, and interpreted. The referent is a lexical unit built by joining words, not a bonded chemical substance, a growth rule for money, or a many-unit eye.[3]

Unit

One word built by joining two or more words or roots into a single lexical item

Recovery means

Not applicable

Measured by

Identified by tests for wordhood such as a single main stress, fixed internal order, and resistance to modification of the parts