Matches in SemOpenAlex for { <https://semopenalex.org/work/W2025173048> ?p ?o ?g. }
Showing items 1 to 72 of
72
with 100 items per page.
- W2025173048 endingPage "2756" @default.
- W2025173048 startingPage "2752" @default.
- W2025173048 abstract "It is commonly assumed that the distribution of molecular velocities follows a Maxwellian distribution also in the range of high and ultrahigh vacuum, i.e., at large Knudsen numbers. This distribution is theoretically derived from statistical analysis of an ensemble of molecules with frequent molecule–molecule collisions. Such a situation prevails at higher pressures, i.e., at small Knudsen numbers. However, at smaller pressures the molecule–wall collisions prevail, and due to the different nature of these collisions, the statistical arguments fail. As a consequence, the molecular velocity distribution cannot be predicted a priori at such pressures. In the present paper the applicability of the Maxwellian distribution in vacuum metrology at large Knudsen numbers, i.e., in the molecular regime is investigated. For this purpose, the pressures generated in primary standards of the static and dynamic expansion type are calculated for an arbitrary velocity distribution after expansion. The pressure generated by static expansion is proportional to the expectation value 〈v2z〉, that generated by dynamic expansion proportional to the ratio of expectation values 〈v2z〉/〈‖vz‖〉 (vz denotes the one-dimensional velocity component). Available experimental calibration data obtained by static and dynamic expansion of common gases are compared to each other and with direct pressure measurements with a liquid column manometer. These data provide a decisive test for the expectation values 〈v2z〉 and 〈‖vz‖〉 in the molecular range. Excellent agreement within the uncertainty of less than 1% between experimental values and values calculated assuming a Maxwellian distribution is found. Thus one may conclude that in common vacuum metrology the Maxwellian distribution can be applied for deriving pressures also in the molecular regime with high accuracy." @default.
- W2025173048 created "2016-06-24" @default.
- W2025173048 creator A5029458710 @default.
- W2025173048 creator A5091456862 @default.
- W2025173048 date "1991-09-01" @default.
- W2025173048 modified "2023-09-25" @default.
- W2025173048 title "Molecular velocity distribution at large Knudsen numbers" @default.
- W2025173048 doi "https://doi.org/10.1116/1.577194" @default.
- W2025173048 hasPublicationYear "1991" @default.
- W2025173048 type Work @default.
- W2025173048 sameAs 2025173048 @default.
- W2025173048 citedByCount "14" @default.
- W2025173048 countsByYear W20251730482012 @default.
- W2025173048 countsByYear W20251730482014 @default.
- W2025173048 countsByYear W20251730482019 @default.
- W2025173048 countsByYear W20251730482023 @default.
- W2025173048 crossrefType "journal-article" @default.
- W2025173048 hasAuthorship W2025173048A5029458710 @default.
- W2025173048 hasAuthorship W2025173048A5091456862 @default.
- W2025173048 hasConcept C110121322 @default.
- W2025173048 hasConcept C121332964 @default.
- W2025173048 hasConcept C121838276 @default.
- W2025173048 hasConcept C121864883 @default.
- W2025173048 hasConcept C134306372 @default.
- W2025173048 hasConcept C159985019 @default.
- W2025173048 hasConcept C165838908 @default.
- W2025173048 hasConcept C185592680 @default.
- W2025173048 hasConcept C186603090 @default.
- W2025173048 hasConcept C192562407 @default.
- W2025173048 hasConcept C195766429 @default.
- W2025173048 hasConcept C204323151 @default.
- W2025173048 hasConcept C2780096971 @default.
- W2025173048 hasConcept C33923547 @default.
- W2025173048 hasConcept C62520636 @default.
- W2025173048 hasConcept C97355855 @default.
- W2025173048 hasConceptScore W2025173048C110121322 @default.
- W2025173048 hasConceptScore W2025173048C121332964 @default.
- W2025173048 hasConceptScore W2025173048C121838276 @default.
- W2025173048 hasConceptScore W2025173048C121864883 @default.
- W2025173048 hasConceptScore W2025173048C134306372 @default.
- W2025173048 hasConceptScore W2025173048C159985019 @default.
- W2025173048 hasConceptScore W2025173048C165838908 @default.
- W2025173048 hasConceptScore W2025173048C185592680 @default.
- W2025173048 hasConceptScore W2025173048C186603090 @default.
- W2025173048 hasConceptScore W2025173048C192562407 @default.
- W2025173048 hasConceptScore W2025173048C195766429 @default.
- W2025173048 hasConceptScore W2025173048C204323151 @default.
- W2025173048 hasConceptScore W2025173048C2780096971 @default.
- W2025173048 hasConceptScore W2025173048C33923547 @default.
- W2025173048 hasConceptScore W2025173048C62520636 @default.
- W2025173048 hasConceptScore W2025173048C97355855 @default.
- W2025173048 hasIssue "5" @default.
- W2025173048 hasLocation W20251730481 @default.
- W2025173048 hasOpenAccess W2025173048 @default.
- W2025173048 hasPrimaryLocation W20251730481 @default.
- W2025173048 hasRelatedWork W1968364279 @default.
- W2025173048 hasRelatedWork W1984723856 @default.
- W2025173048 hasRelatedWork W2047974354 @default.
- W2025173048 hasRelatedWork W2076709666 @default.
- W2025173048 hasRelatedWork W2077401931 @default.
- W2025173048 hasRelatedWork W2122576995 @default.
- W2025173048 hasRelatedWork W2316764245 @default.
- W2025173048 hasRelatedWork W3163219856 @default.
- W2025173048 hasRelatedWork W46550904 @default.
- W2025173048 hasRelatedWork W2505980828 @default.
- W2025173048 hasVolume "9" @default.
- W2025173048 isParatext "false" @default.
- W2025173048 isRetracted "false" @default.
- W2025173048 magId "2025173048" @default.
- W2025173048 workType "article" @default.