impalpable

WordNet

not perceptible to the touch; "an impalpable pulse"
imperceptible to the senses or the mind; "an impalpable cloud"; "impalpable shadows"; "impalpable distinctions"; "as impalpable as a dream"

PrepTutorEJDIC

手で触れない,触知(感知)できない / (差異などが)なかなか理解できない,微妙な

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2017/01/23 18:53:02」(JST)

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An unobservable (also called impalpable) is an entity whose existence, nature, properties, qualities or relations are not directly observable by humans. In philosophy of science, typical examples of "unobservables" are atomic particles, the force of gravity, causation and beliefs or desires.^{[citation needed]} However, some philosophers (ex. George Berkeley) also characterize all objects—trees, tables, other minds, microorganisms, every thing to which humans ascribe as the thing causing their perception—as unobservable.

"Unobservables" is a reference similar to Immanuel Kant's distinction between noumena (things-in-themselves, i.e., raw things in their necessarily unknowable state,^[1] before they pass through the formalizing apparatus of the senses and the mind in order to become perceived objects) and phenomena (the perceived object). According to Kant, humans can never know noumena; all that humans know is the phenomena. Kant's distinction is similar to John Locke's distinction between primary and secondary qualities. Secondary qualities are what humans perceive such as redness, chirping, heat, mustiness or sweetness. Primary qualities would be the actual qualities of the things themselves which give rise to the secondary qualities which humans perceive.^{[citation needed]}

The ontological nature and epistemological issues concerning unobservables is a central topic in philosophy of science. The notion that a given unobservable exists is referred to as scientific realism, in contrast to instrumentalism, the notion that unobservables such as atoms are useful models but don't necessarily exist.

W. V. Metcalf distinguishes three kinds of unobservables.^[2] One is the logically unobservable, which involves a contradiction. An example would be a length which is both longer and shorter than a given length. The second is the practically unobservable, that which we can conceive of as observable by the known sense-faculties of man but we are prevented from observing by practical difficulties. The third kind is the physically unobservable, that which can never be observed by any existing sense-faculties of man.

References

^ Stephen Palmquist, "The Radical Unknowability of Kant's 'Thing in Itself'", Cogito 3:2 (March 1985), pp.101-115; reprinted as Appendix V of Kant's System of Perspectives (University Press of America, 1993).
^ Metcalf, W. V. (1940). "The Reality of the Unobservable". Philosophy of Science. 7 (3): 337–341. doi:10.1086/286640. JSTOR 184849.

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[1] Stephen Palmquist, "The Radical Unknowability of Kant's 'Thing in Itself'", Cogito 3:2 (March 1985), pp.101-115; reprinted as Appendix V of Kant's System of Perspectives (University Press of America, 1993).

[2] Metcalf, W. V. (1940). "The Reality of the Unobservable". Philosophy of Science. 7 (3): 337–341. doi:10.1086/286640. JSTOR 184849.

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