Superseded theories in science

Source: Wikipedia, the free encyclopedia.

The obsolete geocentric model places Earth at the centre of the Universe.

This list catalogs well-accepted theories in science and pre-scientific

scientific theories. Many discarded explanations were once supported by a scientific consensus, but replaced after more empirical information became available that identified flaws and prompted new theories which better explain the available data. Pre-modern explanations originated before the scientific method
, with varying degrees of empirical support.

Some theories are discarded in their entirety, such as the replacement of the phlogiston theory by energy and thermodynamics. Some theories known to be incomplete or in some ways incorrect are still used. For example, Newtonian classical mechanics is accurate enough for practical calculations at everyday distances and velocities, and it is still taught in schools. The more complicated relativistic mechanics must be used for long distances and velocities nearing the speed of light, and quantum mechanics for very small distances and objects.

Some aspects of discarded theories are reused in modern explanations. For example, miasma theory proposed that all diseases were transmitted by "bad air". The modern germ theory of disease has found that diseases are caused by microorganisms, which can be transmitted by a variety of routes, including touching a contaminated object, blood, and contaminated water. Malaria was discovered to be a mosquito-borne disease, explaining why avoiding the "bad air" near swamps prevented it. Increasing ventilation of fresh air, one of the remedies proposed by miasma theory, does remain useful in some circumstances to expel germs spread by airborne transmission, such as SARS-CoV-2.[1]

Some theories originate in, or are perpetuated by, pseudoscience, which claims to be both scientific and factual, but fails to follow the scientific method. Scientific theories are testable and make falsifiable predictions.[2] Thus, it can be a mark of good science if a discipline has a growing list of superseded theories, and conversely, a lack of superseded theories can indicate problems in following the use of the scientific method. Fringe science includes theories that are not currently supported by a consensus in the mainstream scientific community, either because they never had sufficient empirical support, because they were previously mainstream but later disproven, or because they are preliminary theories also known as protoscience which go on to become mainstream after empirical confirmation. Some theories, such as Lysenkoism, race science or female hysteria have been generated for political rather than empirical reasons and promoted by force.

Discarded theories

Biology

Chemistry

Physics

  • Emission theory of vision – the belief that vision is caused by rays emanating from the eyes was superseded by the intro-mission approach and more complex theories of vision.
  • Newtonian physics
    .
  • Ptolemy's law of refraction, replaced by Snell's law.
  • Luminiferous aether – failed to be detected by the sufficiently sensitive Michelson–Morley experiment, made obsolete by Einstein's work.
  • Joule
    's work.
  • Contact tension
    – a theory on the source of electricity.
  • Gottfried Leibniz
    's elementary and limited early formulation of the principle of conservation of energy.
  • "Purely
    generation of voltage differences
    .
  • Emitter theory – another now-obsolete theory of light propagation.
  • voltaic cell to be a new type of force acting on the charges generated merely from contact of the electrodes. Michael Faraday
    later correctly explained the active agent was chemical reactions.
  • Balance of nature – superseded by catastrophe theory and chaos theory.
  • Progression of
    atomic theory
    • Democritus, the originator of atomic theory, held that everything is composed of atoms that are indestructible. His claim that atoms are indestructible is not the reason it is superseded—as it was later scientists who identified the concept of atoms with particles, which later science showed are destructible. Democritus' theory is superseded because of his position that several kinds of atoms explain pure materials like water or iron, and characteristics that science now identifies with molecules rather than with indestructible primary particles. Democritus also held that between atoms, an empty space of a different nature than atoms allowed atoms to move. This view on space and matter persisted until Einstein described spacetime as being relative and connected to matter.
    • John Dalton's model of the atom, which held that atoms are indivisible and indestructible (superseded by nuclear physics) and that all atoms of a given element are identical in mass (superseded by discovery of atomic isotopes).[13]
    • Plum pudding model of the atom—assuming the protons and electrons were mixed together in a single mass
    • Rutherford model of the atom with an impenetrable nucleus orbited by electrons
    • Bohr model with quantized orbits
    • Electron cloud model following the development of quantum mechanics in 1925 and the eventual atomic orbital
      models derived from the quantum mechanical solution to the hydrogen atom

Astronomy and cosmology

Geography and climate

Geology

Psychology

Medicine

Obsolete branches of enquiry

Theories now considered incomplete

These theories that are no longer considered the most complete representation of reality but remain useful in particular domains or under certain conditions. For some theories, a more complete model is known, but for practical use, the coarser approximation provides good results with much less calculation.

See also

Lists

Notes

  1. ^ Antipodes and antichthones do literally exist as opposite points on the Earth and people who live on and around them, but do not have any of the unique properties ascribed to them by ancient or medieval authors.

References

  1. Washington Post
    .
  2. ^ Popper, Karl (1963), Conjectures and Refutations, Routledge and Kegan Paul, London, UK. Reprinted in Theodore Schick (ed., 2000), Readings in the Philosophy of Science, Mayfield Publishing Company, Mountain View, Calif.
  3. ^ "Spontaneous generation | Examples & Experiments | Britannica".
  4. PMID 25917417
    .
  5. .
  6. ^ Bechtel, William; Williamson, Robert C. (1998). "Vitalism". In E. Craig (ed.). Routledge Encyclopedia of Philosophy. Routledge.
  7. ^ Havelock Ellis, Studies in the Psychology of Sex, vol. 5 p. 218
  8. .
  9. ^ "AAA Statement on Race". American Anthropological Association. Retrieved December 15, 2018.
  10. ^ "germline theory". Glossary. NCBI.
  11. ^ Lefers, Mark. "germ-line theory". Glossary. Northwestern University. Retrieved February 28, 2012.
  12. ^ Jensen, William B. (1990). "Whatever Happened to the Nascent State?" (PDF). Bulletin for the History of Chemistry (5): 26–36. Retrieved May 6, 2017.
  13. ^ De Leon, Professor N. "Dalton's Atomic Theory". Chemistry 101 Class Notes. Indiana University Northwest. Retrieved August 26, 2013.
  14. ^ Rob Garner. "NASA's WFIRST Will Help Uncover Universe's Fate". Retrieved September 3, 2023.
  15. .
  16. ^ An inland sea, the Eromanga Sea, did exist there in the Mesozoic, but not during any period of human history
  17. ^ Glacial Theory
  18. ^ Crain, Stephen and Diane C. Lillo-Martin (1999). An Introduction to Linguistic Theory and Language Acquisition. Oxford: Blackwell.
  19. ^ Steven Novella, MD. "Psychomotor Patterning". Retrieved October 16, 2014.
  20. ^ Aerodynamics: Selected Topics in the Light of Their Historical Development, book by Theodore Von Karman, 1954, Dover Publications, p10 and following pages Detailed discussion of Newton's sine-square law, invalidity in the general case and applicability at high supersonic speeds.
  21. S2CID 128907423
    .

External links