RRB Group D 1-Dec-2013 Shift 1 Solved Paper

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. This could be an increase in volume, boiling point, viscosity or other physical characteristic or property of the substance, as water molecules can become suspended between the substance's molecules in the process.