| dbo:abstract
|
- The Carr index (also: Carr's index or Carr's Compressibility Index) is an indicator of the compressibility of a powder. It is named after the scientist Ralph J. Carr, Jr. The Carr index is calculated by the formula , where is the freely settled bulk density of the powder, and is the tapped bulk density of the powder after "tapping down". It can also be expressed as . The Carr index is frequently used in pharmaceutics as an indication of the compresiblity of a powder. In a free-flowing powder, the bulk density and tapped density would be close in value, therefore, the Carr index would be small. On the other hand, in a poor-flowing powder where there are greater interparticle interactions, the difference between the bulk and tapped density observed would be greater, therefore, the Carr index would be larger. A Carr index greater than 25 is considered to be an indication of poor flowability, and below 15, of good flowability. Another way to measure the flow of a powder is the Hausner ratio, which can be expressed as . Both the Hausner ratio and the Carr index are sometimes criticized, despite their relationships to flowability being established empirically, as not having a strong theoretical basis. Use of these measures persists, however, because the equipment required to perform the analysis is relatively cheap and the technique is easy to learn. (en)
- L' indice de Carr (Carr's index ou Carr's Compressibility Index en anglais) est une grandeur physique sans dimension qui caractérise l'aptitude à la compressibilité d'une poudre ou d'un matériau granulaire. Cet indice a été défini par le pharmacien Charles Jelleff Carr (1910–2005). (fr)
|
| dbo:wikiPageID
| |
| dbo:wikiPageLength
|
- 2681 (xsd:nonNegativeInteger)
|
| dbo:wikiPageRevisionID
| |
| dbo:wikiPageWikiLink
| |
| dbp:wikiPageUsesTemplate
| |
| dcterms:subject
| |
| rdf:type
| |
| rdfs:comment
|
- L' indice de Carr (Carr's index ou Carr's Compressibility Index en anglais) est une grandeur physique sans dimension qui caractérise l'aptitude à la compressibilité d'une poudre ou d'un matériau granulaire. Cet indice a été défini par le pharmacien Charles Jelleff Carr (1910–2005). (fr)
- The Carr index (also: Carr's index or Carr's Compressibility Index) is an indicator of the compressibility of a powder. It is named after the scientist Ralph J. Carr, Jr. The Carr index is calculated by the formula , where is the freely settled bulk density of the powder, and is the tapped bulk density of the powder after "tapping down". It can also be expressed as . Another way to measure the flow of a powder is the Hausner ratio, which can be expressed as . (en)
|
| rdfs:label
|
- Carr index (en)
- Indice de Carr (fr)
|
| owl:sameAs
| |
| prov:wasDerivedFrom
| |
| foaf:isPrimaryTopicOf
| |
| is dbo:wikiPageDisambiguates
of | |
| is dbo:wikiPageWikiLink
of | |
| is foaf:primaryTopic
of | |
