What defines free water?

Free water is defined as liquid moisture that is not chemically bound to surfaces or materials and can be removed readily. In the context of drying, it refers to excess moisture that can be extracted through physical means such as evaporation or dehumidification. This type of water poses a risk for mold and structural damage if not addressed promptly, which is why it's crucial for restoration professionals to identify and remove it during the drying process.

The other definitions pertain to different forms or situations involving water. For instance, moisture that is chemically bound to materials refers to water that is integral to the material's structure and cannot be removed without altering the material itself. Water vapor in the atmosphere relates to humidity and is not considered free water since it is not in liquid form that can be extracted directly from surfaces. Lastly, water stored in the cellular structure is likewise not classified as free water because it is absorbed at a molecular level within the material, making it more complex to remove than simply extracting free-standing liquid moisture.