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Hygroscopicity |
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Hygroscopicity
the ability of materials to absorb moisture from the air. Hygroscopicity is a property of wettable (hydrophilic) materials of capillary-porous structure (such as wood and grain), in whose fine capillaries moisture condenses; of water-soluble substances such as table salt, sugar, and concentrated sulfuric acid; and especially of chemical compounds that form, with water, crystalline hydrates. The amount of water absorbed by a porous material (hygroscopic wetness, or Whyg) increases as the moisture content of the air increases, reaching a maximum when the relative humidity of the air is 100 percent. For wood, the maximum Whyg is about 30 percent (in terms of weight), whereas for wheat it is about 35 percent. It is important to know the hygroscopicity of a material in order to determine drying and wetting processes. Hygroscopicity is also considered in long-term storage and transportation of materials, especially by sea. Hygroscopicity explains the dampening and even deliquescence of a number of salts when stored in the open air. Some hygroscopic substances, such as concentrated sulfuric acid, are used to dry the air. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | Data on physical properties includes coverage of such properties as boiling point, bulk and tap density, compression characteristics, hygroscopicity, flowability, melting point, moisture content, moisture-absorption isotherms, particle size distribution, rheology, specific surface area, and solubility. Lactitol's low hygroscopicity helps to increase shelf-life, especially in humid conditions, and this is well utilized in compressed tablets, making it an excellent pharmaceutical excipient. [ILLUSTRATION OMITTED] Applications include the impact of hygroscopicity, water sorption kinetics and water induced morphology changes (eg amorphous content) in pharmaceutical powders, tablets, APIs and excipient materials. |
Hygroscopicity |
hygrophytes hygrophytes hygrophytic Hygroplasm hygroscope hygroscope hygroscopes hygroscopes hygroscopic hygroscopic hygroscopic hygroscopic coefficient hygroscopic depression hygroscopic expansion hygroscopic expansion hygroscopic expansion hygroscopic expansion hygroscopic expansion hygroscopic humidifier hygroscopic investment hygroscopic investment hygroscopic investment hygroscopic investment hygroscopic investment Hygroscopic Moisture Content Hygroscopic Tandem Differential Mobility Analyzer hygroscopic water hygroscopically hygroscopically hygroscopically Hygroscopicity HygroscopyHygroscopy Hygroscopy hygrostat hygrostat Hygrostatics hygrothermograph Hygroton Hygroton Hygrotrama Hygrotrama foetens HYGS HYGSS HYH HYHA HYHC HYHF HYHG HYHU Hyi Hyi Hyi HYIA HYIC HYIF hying hying hying Hyip HYIPE | |||||||
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