oil-drop experiment
E331182
The oil-drop experiment was a landmark early 20th-century physics experiment that measured the elementary electric charge of the electron by observing tiny charged oil droplets suspended in an electric field.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Millikan oil-drop experiment | 2 |
| Millikan oil-drop apparatus | 1 |
| oil-drop experiment canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3150733 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
Target entity: oil-drop experiment Context triple: [Robert A. Millikan, knownFor, oil-drop experiment]
-
A.
Trouton–Noble experiment
The Trouton–Noble experiment was an early 20th-century test of the luminiferous aether that searched for a torque on a charged capacitor in motion and, by finding no such effect, provided support for the emerging theory of special relativity.
-
B.
Franck–Hertz experiment
The Franck–Hertz experiment is a landmark early-20th-century physics experiment that provided direct evidence for the quantization of atomic energy levels, supporting the Bohr model of the atom.
-
C.
Cavendish experiment
The Cavendish experiment was an 18th-century physics experiment by Henry Cavendish that measured the tiny gravitational attraction between lead spheres, allowing the first calculation of the gravitational constant and the mass of the Earth.
-
D.
Cockcroft–Walton experiment
The Cockcroft–Walton experiment was a pioneering 1932 nuclear physics experiment that achieved the first artificial disintegration of atomic nuclei using accelerated protons, confirming Einstein’s mass–energy equivalence.
-
E.
Eötvös experiment
The Eötvös experiment is a classic physics test of the equivalence principle that measures whether different materials fall with the same acceleration in a gravitational field.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
Target entity: oil-drop experiment Target entity description: The oil-drop experiment was a landmark early 20th-century physics experiment that measured the elementary electric charge of the electron by observing tiny charged oil droplets suspended in an electric field.
-
A.
Trouton–Noble experiment
The Trouton–Noble experiment was an early 20th-century test of the luminiferous aether that searched for a torque on a charged capacitor in motion and, by finding no such effect, provided support for the emerging theory of special relativity.
-
B.
Franck–Hertz experiment
The Franck–Hertz experiment is a landmark early-20th-century physics experiment that provided direct evidence for the quantization of atomic energy levels, supporting the Bohr model of the atom.
-
C.
Cavendish experiment
The Cavendish experiment was an 18th-century physics experiment by Henry Cavendish that measured the tiny gravitational attraction between lead spheres, allowing the first calculation of the gravitational constant and the mass of the Earth.
-
D.
Cockcroft–Walton experiment
The Cockcroft–Walton experiment was a pioneering 1932 nuclear physics experiment that achieved the first artificial disintegration of atomic nuclei using accelerated protons, confirming Einstein’s mass–energy equivalence.
-
E.
Eötvös experiment
The Eötvös experiment is a classic physics test of the equivalence principle that measures whether different materials fall with the same acceleration in a gravitational field.
- F. None of above. chosen
Statements (51)
| Predicate | Object |
|---|---|
| instanceOf |
landmark experiment in physics
ⓘ
measurement of elementary charge ⓘ physics experiment ⓘ |
| alsoKnownAs |
oil-drop experiment
ⓘ
surface form:
Millikan oil-drop experiment
|
| awardedRecognition |
Nobel Prize in Physics
ⓘ
surface form:
Nobel Prize in Physics 1923 to Robert A. Millikan
|
| country | United States of America ⓘ |
| demonstrated | quantization of electric charge ⓘ |
| endDate | 1910 ⓘ |
| era | early 20th century ⓘ |
| field | physics ⓘ |
| hasUncertainty | systematic errors later discussed by historians of science ⓘ |
| influenced |
development of quantum theory
ⓘ
precision measurements in particle physics ⓘ |
| keyConcept |
Brownian motion
ⓘ
electric charge ⓘ electric force ⓘ gravitational force ⓘ viscous drag ⓘ |
| leadResearcher |
Robert A. Millikan
ⓘ
surface form:
Robert Andrews Millikan
|
| location | University of Chicago ⓘ |
| measuredQuantity |
electron charge
ⓘ
elementary charge ⓘ |
| performedBy |
Harvey Fletcher
ⓘ
Robert A. Millikan ⓘ
surface form:
Robert Andrews Millikan
|
| primaryPurpose | measurement of the elementary electric charge ⓘ |
| relatedTo |
electron
ⓘ
elementary charge ⓘ photoelectric effect experiments ⓘ |
| resultedIn |
improved value of Avogadro constant
ⓘ
precise value of the elementary charge ⓘ |
| startDate | 1909 ⓘ |
| subfield |
atomic physics
ⓘ
electromagnetism ⓘ experimental physics ⓘ |
| supportedTheory |
atomic theory of matter
ⓘ
existence of discrete electrons ⓘ |
| usedMethod |
Stokes law for viscous drag
ⓘ
balancing gravitational and electric forces ⓘ statistical analysis of multiple droplets ⓘ terminal velocity measurement ⓘ |
| usedObject |
X-ray source to ionize air
ⓘ
atomizer to spray oil ⓘ capacitor plates ⓘ charged oil droplets ⓘ electric field between plates ⓘ horizontal metal plates ⓘ light source for illumination ⓘ microscope for observation ⓘ stopwatch ⓘ tiny oil droplets ⓘ vacuum chamber or enclosed chamber ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Subject: oil-drop experiment Description of subject: The oil-drop experiment was a landmark early 20th-century physics experiment that measured the elementary electric charge of the electron by observing tiny charged oil droplets suspended in an electric field.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.