Answer :
A Hygroscopic salt is a salt which can absorb water results in the extraction of water from the atmosphere.
The water comes from the water vapor in the atmosphere. This process occurs at room temperature. Hygroscopic substance doesn't dissolve as it absorbs water. It changes its physical properties like color changes and viscosity also changes but the chemical properties doesn't change. This process either occurs through absorption or adsorption. It attracts water from the surrounding. It is hygroscopic because of the net positive charge of its chemical components and the atmosphere has negative charge. Leaving  hygroscopic salt open to atmosphere on the temperature change results in the extraction of water from air. This process can be supported by hygroscopic salt.
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