viscosity or some other physical characteristic or property of the substance. For example, a finely dispersed hygroscopic powder, such as a salt, may become clumpy over time due to collection of moisture from the surrounding environment.

Deliquescent materials are sufficiently hygroscopic that they dissolve in the water they absorb, forming an aqueous solution.

Hygroscopy is essential for many plant and animal species' attainment of hydration,

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