Hausner ratio
Hausner Ratio
The Hausner Ratio (pronounced: /ˈhɔːznər ˈreɪʃioʊ/) is a dimensionless, empirical measure used in the field of pharmaceutics to quantify the flowability of powders. It is named after the scientist Herbert Hausner, who first introduced the concept.
Etymology
The term "Hausner Ratio" is derived from the name of the scientist Herbert Hausner. He was a prominent researcher in the field of powder technology, and his work has had a significant impact on the pharmaceutical industry.
Definition
The Hausner Ratio is defined as the ratio of the tapped density of a powder to its bulk density. It is a measure of the potential for a powder to increase in density when tapped or vibrated, which is a common occurrence in many industrial processes.
Formula
The Hausner Ratio (HR) is calculated using the following formula:
HR = ρ_t/ρ_b
where:
- ρ_t is the tapped density of the powder
- ρ_b is the bulk density of the powder
Related Terms
- Bulk Density: The mass of a powder divided by its volume, including the contribution of the interparticulate void volume.
- Tapped Density: The increased density of a powder achieved by mechanically tapping a measuring cylinder containing the sample.
- Flowability: The ability of a powder to flow in a desired manner in a specific piece of equipment.
- Pharmaceutics: The discipline of pharmacy that deals with the process of turning a new chemical entity (NCE) or old drugs into a medication to be used safely and effectively by patients.
See Also
External links
- Medical encyclopedia article on Hausner ratio
- Wikipedia's article - Hausner ratio
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