Deliquescence is a process where a substance absorbs moisture from the air and dissolves in the water it collects. This phenomenon typically occurs with certain salts, such as calcium chloride or sodium hydroxide, which can attract enough humidity to form a liquid solution. This process is often observed in humid environments, where the air contains a significant amount of water vapor. Deliquescent materials are commonly used in various applications, including dehumidifiers and desiccants, to control moisture levels in packaging and storage.