Deliquesce

Deliquesce (pronounced del-i-kwes)

(1) In physical chemistry, to become liquid by absorbing moisture from the atmosphere and dissolving in it (best illustrated by the behavior of certain salts).

(2) To melt away; to disappear (used literally & figuratively).

(3) In botany, branching so the stem is lost in branches (as is typical in deciduous trees).

(4) In mycology (of the fruiting body of a fungus), becoming liquid as a phase of its life cycle.

1756: From the Latin dēliquēscere (to become liquid), the construct being dē- + liquēscere (to liquefy; liquescent).  In scientific literature, the adjective deliquescent (liquefying in air) is the most commonly used form.  It was from the Latin deliquescentem (nominative deliquescens), present participle of deliquescere (to melt away), the construct being de- + liquesco (I melt) and familiar in French also as déliquescent.  The de- prefix was from the Latin dē-, from the preposition dē (of, from (the Old English æf- was a similar prefix).  It imparted the sense of (1) reversal, undoing, removing, (2) intensification and (3) from, off.  In French the dé- prefix was used to make antonyms (as un- & dis- function in English) and was partially inherited from the Old and Middle French des-, from the Latin dis- (part), the ultimate source being the primitive Indo-European dwís and partially borrowed from Latin dē-.  The figurative sense of “apt to dissolve or melt away” was in use by 1837 while the verb deliquesce appears not to have been used thus until the late 1850s.  In scientific literature, the adjective deliquescent (liquefying in air) is the most commonly used form.  It was from the Latin deliquescentem (nominative deliquescens), present participle of deliquescere (to melt away), the construct being de- + liquesco (I melt) and familiar in French also as déliquescent.  The figurative sense of “apt to dissolve or melt away” was in use by 1837 while the verb deliquesce appears not to have been used thus until the late 1850s.    Deliquesce, deliquesced & deliquescing are verbs, deliquescent is an adjective, deliquescence is a noun and deliquescently is an adverb; the noun plural is deliquescences.

Deliquesce 1, oil on canvas by Tammy Flynn Seybold (b 1966).

This was the first in the Deliquesce Series, a group of works exploring the themes of transformation and conservation of energy in human forms, the artist noting being intrigued by the deceptively ephemeral nature of materials: “We think of objects - human forms included - as decaying, degrading or ‘disappearing’ but, as we know from the laws of thermodynamics, all energy is conserved - like matter, it is merely transformed from one form to another.  This work, painted with pastel-hued oils was made directly from a live model, the drips allowed organically to happen from her languid form and by using light, bright hues, I hoped to bring a spirit of optimism to this transformative process.”

A footnote to the addition of deliquesce to scientific English is a tale of the chance intersection of politics and chemistry.  Dr Charles Lucas (1713–1771) was an Anglo-Irish physician who held the seat of Dublin City in the Irish Parliament and was what now would be called “a radical”, dubbed at the time “Irish Wilkes” (a nod to the English radical politician John Wilkes (1725–1797).  His early career was as an apothecary and he was shocked discover the fraud and corruption which permeated the industry and in an attempt to reform the abuses published A Short Scheme for Preventing Frauds and Abuses in Pharmacy (1735) which much upset his fellow apothecaries who were the beneficiaries of the crooked ways but the parliament did respond and created legislation regulating standards in medicines and providing for the inspection of the products; it was the first of its kind in the English-speaking world and the ancestor of the elaborate framework of rules today administered by entities such as the US FDA (Food & Drug Administration.  Encouraged, he later published Pharmacomastix, or the Office, Use, and Abuse of Apothecaries Explained (1741), the contents of which were used by the parliament to make certain legislative amendments.

However, as well as a radical, Lucas was a idealist and while the establishment was content to support him in matter of pills and potions, when he intruded into areas which disturbed the political equilibrium, they were less tolerant and, facing imprisonment, Lucas fled to the continent where he’d decided to study medicine, graduating as a doctor in 1752.  One of his first projects as a physician was a study of the composition of certain mineral waters, substances then held to possess some remarkable curative properties (something actually not without some basis).  To undertake his research he visited a number of sites including Spa, Aachen in what is now North Rhine-Westphalia and Bath in the English county of Somerset.  The material he assembled and published as An Essay on Waters. In three Parts: (i) of Simple Waters, (ii) of Cold Medicated Waters, (iii) of Natural Baths (1756) and it was in this work that the verb “deliquesce” first appeared.  Ever the “disturber” Dr Lucas’s tract upset the medical establishment in much the same way two decades earlier he’d stirred the enmity of the apothecaries, the cluster of physicians clustered around the Bath spa angered the interloper hadn’t consulted with them on a topic over which they asserted proprietorship.

Lindsay Lohan and her lawyer in court, Los Angeles, December 2011.

In chemistry, the companion word of deliquescence is hygroscopy, both describing phenomena related to the ability of substances to absorb moisture from the surrounding environment, but they differ in extent and behavior.  Hygroscopy refers to the ability of a substance to absorb moisture from the air when exposed; hygroscopic substances can attract and hold water molecules onto their surface but tend not to dissolve.  Many salts behave thus and a well-known example of practical application is the silica gel, which, in small porous packages, is often used as a desiccant to absorb moisture in packaging. Deliquescence can be thought of an extreme form of hygroscopy (hydroscopy taken to its natural conclusion) in that a substance which deliquesces not only absorbs moisture from the air but also absorbs it to the point where it dissolves completely in the absorbed water, forming a solution.  In the natural environment, this happens most frequently when the relative humidity of the surrounding air is high and the classic deliquescent substances are salts like calcium chloride, magnesium chloride, zinc chloride, ferric chloride, carnallite, potassium carbonate, potassium phosphate, ferric ammonium citrate, ammonium nitrate, potassium hydroxide, & sodium hydroxide.  Presumably because deliquescence is the extreme form of hydroscopy it was the former which came to be used figuratively (dissolving into “nothing”) while the latter did not.

At the chemical level, hygroscopy (a class in which scientists include deliquescence as a sub-set) describes the phenomenon of attracting and holding water molecules via either absorption or adsorption (the adhesion of a liquid or gas on the surface of a solid material, forming a thin film on the surface.) from the surrounding environment.  Hygroscopy is integral to the biology of many plant and animal species' attainment of hydration, nutrition, reproduction and/or seed dispersal.  Linguistically, hygroscopy is quirky in that the construct is hygro- (moisture; humidity), from the Ancient Greek ὑγρός (hugrós) (wet, moist) + -scopy (observation, viewing), from the Ancient Greek σκοπέω (skopéō) (to see (and the source of the Modern English “scope”) yet unlike other forms suffixed by “-scopy”, it no longer conveys the sense of “viewing or imaging”.  Originally that was the case, a hygroscope in the late eighteenth century understood as a device used to measure humidity but in a wholly organic way this use faded (“dissolving deliquescently to nothing” as it were) while hygroscopic (tending to retain moisture) & hygroscopy (the ability to do so) endured.  The modern instrument used to measure humidity is hygrometer, the construct being hygro- + -meter (the suffix from the Ancient Greek μέτρον (métron) (measure) used to form the names of measuring devices.