Phlogiston theory


Phlogiston theory
The alchemist and physician J. J. Becher proposed the phlogiston theory

The phlogiston theory (from the Ancient Greek φλογιστόν phlogistón "burning up", from φλόξ phlóx "flame"), first stated in 1667 by Johann Joachim Becher, is an obsolete scientific theory that postulated the existence of a fire-like element called "phlogiston", which was contained within combustible bodies and released during combustion. The theory was an attempt to explain processes of burning such as combustion and the rusting of metals, which are now collectively known as oxidation.

Contents

Theory

The theory holds that all combustible resources contain phlogiston, a substance without colour, odor, taste or mass, and is liberated in burning. Once burned, the "dephlogisticated" substance was held to be in its "true" form, the calx.

Phlogiston theory was a 17th century attempt to explain oxidation processes such as fire and rust

"Phlogisticated" substances are those that contain phlogiston and are "dephlogisticated" when burned; "in general, substances that burned in air were said to be rich in phlogiston; the fact that combustion soon ceased in an enclosed space was taken as clear-cut evidence that air had the capacity to absorb only a definite amount of phlogiston. When air had become completely phlogisticated it would no longer serve to support combustion of any material, nor would a metal heated in it yield a calx; nor could phlogisticated air support life, for the role of air in respiration was to remove the phlogiston from the body."[1]

Thus, phlogiston was described in a way that was basically the opposite of the role of oxygen in combustion.

Joseph Black's student Daniel Rutherford discovered nitrogen in 1772 and the pair used the theory to explain his results. The residue of air left after burning, in fact a mixture of nitrogen and carbon dioxide, was sometimes referred to as "phlogisticated air", having taken up all of the phlogiston. Conversely, when oxygen was first discovered it was thought to be "dephlogisticated air", capable of combining with more phlogiston and thus supporting combustion for longer than ordinary air.[2]

History of the theory

In 1667, Johann Joachim Becher published his Physical Education, which was the first mention of what would become the phlogiston theory. Traditionally, alchemists considered that there were four classical elements: fire, water, air, and earth. In his book, Becher eliminated fire and air from the classical element model and replaced them with three forms of earth: terra lapidea, terra fluida, and terra pinguis.[3][4] Terra pinguis was the element which imparted oily, sulphurous, or combustible properties.[5] Becher believed that terra pinguis was a key feature of combustion and was released when combustible substances were burned.[3] In 1703 Georg Ernst Stahl, professor of medicine and chemistry at Halle, proposed a variant of the theory in which he renamed Becher's terra pinguis to phlogiston, and it was in this form that the theory probably had its greatest influence.[6]

Challenge and demise

Eventually, quantitative experiments revealed problems, including the fact that some metals, such as magnesium, gained weight when they burned, even though they were supposed to have lost phlogiston. Mikhail Lomonosov attempted to repeat Robert Boyle's celebrated experiment[clarification needed] in 1753 and concluded that the phlogiston theory was false. He wrote in his diary:[citation needed]

"Today I made an experiment in hermetic glass vessels in order to determine whether the mass of metals increases from the action of pure heat. The experiment demonstrated that the famous Robert Boyle was deluded, for without access of air from outside, the mass of the burnt metal remains the same."

Some phlogiston proponents explained this by concluding that phlogiston had negative weight; others, such as Louis-Bernard Guyton de Morveau, gave the more conventional argument that it was lighter than air. However, a more detailed analysis based on the Archimedean principle and the densities of magnesium and its combustion product shows that just being lighter than air cannot account for the increase in mass.

During the eighteenth century, as it became clear that metals gained weight when they were oxidized, phlogiston was increasingly regarded as a principle rather than a material substance.[7] By the end of the eighteenth century, for the few chemists who still used the term phlogiston, the concept was linked to hydrogen. Joseph Priestley, for example, in referring to the reaction of steam on iron, whilst fully acknowledging that the iron gains weight as it binds with oxygen to form a calx, iron oxide, iron also loses “the basis of inflammable air (hydrogen), and this is the substance or principle, to which we give the name phlogiston.”[8] Following Lavoisier’s description of oxygen as the oxidizing principle (hence the name oxygen: oxus = sharp, acid; geneo = generate, produce), Priestley described phlogiston as the alkaline principle.[9]

Phlogiston remained the dominant theory until Antoine-Laurent Lavoisier showed that combustion requires a gas that has weight (oxygen) and could be measured by means of weighing closed vessels. The use of closed vessels also negated the buoyancy which had disguised the weight of the gases of combustion. These observations solved the weight paradox and set the stage for the new caloric theory of combustion.

Enduring aspects

Phlogiston theory permitted chemists to bring clarification of apparently different phenomena into a coherent structure: combustion, metabolism, and configuration of rust. The recognition of the relation between combustion and metabolism was a forerunner of the recognition that the metabolism of living organisms and combustion can be understood in terms of fundamentally related chemical processes.

Notes

  1. ^ James Bryan Conant, ed. The Overthrow of Phlogiston Theory: The Chemical Revolution of 1775–1789. Cambridge: Harvard University Press (1950), 14. OCLC 301515203.
  2. ^ "Priestley, Joseph". Spaceship-earth.de. http://www.spaceship-earth.de/Biograph/Priestley.htm#4A4FW. Retrieved 2009-06-05. 
  3. ^ a b Bowler, Peter J (2005). Making modern science: A historical survey. Chicago: University of Chicago Press. http://books.google.com.au/books?id=-V9jM4FkUacC&printsec=frontcover. 
  4. ^ Becher, Physica Subterranea p. 256 et seq.
  5. ^ Brock, William Hodson (1993). The Norton history of chemistry (1st American ed.). New York: W. W. Norton. ISBN 0393035360. 
  6. ^ Mason, Stephen F., (1962). A History of the Sciences (revised edition). New York: Collier Books. Ch. 26.
  7. ^ For a discussion of how the term phlogiston was understood during the eighteenth century, see: James R Partington & Douglas McKie; “Historical studies on the phlogiston theory;” Annals of Science, 1937, 2, 361-404; 1938, 3, 1-58; and 337-71; 1939, 5, 113-49. Reprinted 1981 as ISBN 9780405138959.
  8. ^ Joseph Priestley; Considerations on the doctrine of phlogiston, and the decomposition of water; Philadelphia, Thomas Dobson, 1796; p.26.
  9. ^ Joseph Priestley; Heads of lectures on a course of experimental philosophy; London, Joseph Johnson, 1794.


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • phlogiston theory — noun : a theory in 18th century chemistry disproved by Lavoisier: every combustible substance is a compound of phlogiston and the phenomena of combustion are due to the liberation of phlogiston with the other constituent left as a residue the… …   Useful english dictionary

  • phlogiston — /floh jis ton, teuhn/, n. a nonexistent chemical that, prior to the discovery of oxygen, was thought to be released during combustion. [1720 30; < NL: inflammability, n. use of Gk phlogistón, neut. of phlogistós inflammable, burnt up; see… …   Universalium

  • Theory — The word theory has many distinct meanings in different fields of knowledge, depending on their methodologies and the context of discussion.In science a theory is a testable model of the manner of interaction of a set of natural phenomena,… …   Wikipedia

  • Phlogiston — Phlo*gis ton, n. [NL., fr. Gr. ? burnt, set on fire, fr. ? to set on fire, to burn, fr. ?, ?, a flame, blaze. See {Phlox}.] (Old Chem.) The hypothetical principle of fire, or inflammability, regarded by Stahl as a chemical element. [1913 Webster] …   The Collaborative International Dictionary of English

  • phlogiston — 1730, hypothetical inflammatory principle, formerly believed to exist in all combustible matter, from Modern Latin (1702), from Gk. phlogiston (1610s in this sense), neut. of phlogistos burnt up, inflammable, from phlogizein to set on fire, burn …   Etymology dictionary

  • Theory of heat — In the history of science, the theory of heat or mechanical theory of heat was a theory, introduced predominantly in 1824 by the French physicist Sadi Carnot, that heat and mechanical work are equivalent.[1] It is related to the mechanical… …   Wikipedia

  • phlogiston — A hypothetical substance of negative mass that, according to the theory of G.E. Stahl, was given off by a substance when it underwent combustion, thus accounting for the decrease in mass of the ash over the original substance; abandoned after the …   Medical dictionary

  • Caloric theory — The caloric theory is an obsolete scientific theory that heat consists of a fluid called caloric that flows from hotter to colder bodies. Caloric was also thought of as a weightless gas that could pass in and out of pores in solids and liquids.… …   Wikipedia

  • chemistry — /kem euh stree/, n., pl. chemistries. 1. the science that deals with the composition and properties of substances and various elementary forms of matter. Cf. element (def. 2). 2. chemical properties, reactions, phenomena, etc.: the chemistry of… …   Universalium

  • Joseph Priestley — (13 March 1733 (Old Style) – 6 February 1804) was an 18th century British theologian, Dissenting clergyman, natural philosopher, educator, and political theorist who published over 150 works. He is usually credited with the discovery of oxygen,… …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.