Definition: The word "aerohydrous" comes from Greek and is a term that means having high moisture content in the air or liquid state. Aerohydrous liquids have very high percentages of water (approximately 90%) by volume, with less than 1% remaining as gases. This means that they are highly absorbent to water and can hold large amounts of water, but their density is much higher than most non-aerohydrous liquids like oil. In the context of chemistry, an aerohydrous substance often refers to a substance that has high vapor pressure compared to its liquid or solid forms. This characteristic allows it to be used in a variety of chemical processes such as separation and purification. For example, in the process of desiccation (removal of moisture from materials), aerohydrous substances like glass are used because they retain their chemical properties when dried out but release water vapor which is released back into the atmosphere.