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Hygroscopy - Revision history
2026-04-24T14:07:43Z
Revision history for this page on the wiki
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Prab: CSV import
2025-02-18T12:13:47Z
<p>CSV import</p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 12:13, 18 February 2025</td>
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Prab
https://wikimd.com/index.php?title=Hygroscopy&diff=5385460&oldid=prev
Prab: CSV import
2024-03-10T22:39:20Z
<p>CSV import</p>
<p><b>New page</b></p><div>'''Hygroscopy''' is the phenomenon of attracting and holding water molecules from the surrounding environment, which is usually at normal or room temperature. This is achieved through either absorption or adsorption with the absorbing or adsorbing substance becoming physically changed somewhat. This could be by an increase in volume, boiling point, viscosity or other physical characteristics or properties of the substance, as water molecules can become suspended between the substance's molecules in the process.<br />
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== Overview ==<br />
[[Zinc chloride]] and [[calcium chloride]], as well as [[potassium hydroxide]] and [[sodium hydroxide]] (and many different salts), are so hygroscopic that they readily dissolve in the water they absorb: this property is called [[deliquescence]]. Not only is [[sulfuric acid]] hygroscopic in concentrated form but its solutions are hygroscopic down to concentrations of 10 Vol-% or below. A hygroscopic material will tend to become damp and cakey when exposed to moist air (such as the salt used in salt shakers during humid weather).<br />
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== Applications ==<br />
Because of their affinity for atmospheric moisture, hygroscopic materials might be used in various products to keep areas dry. They can be used in [[dessicant]] packs in leather products such as shoes and bags to prevent damaging effects from humidity. <br />
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== Measurement ==<br />
The amount of moisture held by hygroscopic materials is usually proportional to the relative humidity. Various materials and manufacturing processes rely on this property. For example, many industries must keep the relative humidity inside their plants at specific levels in order to maintain the quality of their products. <br />
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== See also ==<br />
* [[Deliquescence]]<br />
* [[Efflorescence]]<br />
* [[Humectant]]<br />
* [[Desiccant]]<br />
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[[Category:Physical chemistry]]<br />
[[Category:Chemical properties]]<br />
[[Category:Water]]<br />
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{{chemistry-stub}}<br />
{{medicine-stub}}</div>
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