What does the term 'porous' describe?

The term 'porous' specifically refers to substances that have numerous tiny holes or spaces within their structure, allowing for the absorption or passage of liquids and gases. This characteristic is significant in various contexts, especially in the beauty and health industries, where understanding material properties is crucial for safety and efficacy.

For example, when discussing lash extension materials, knowing that a substrate is porous can influence how adhesives interact with it, as well as how hygienic it remains post-use. A porous material can absorb moisture, which may impact the durability and performance of products applied to or along with it. In contrast, the other choices address different characteristics that do not directly align with the precise definition of 'porous.' Items safe for reuse, materials that can hold liquids, and tools that are easy to disinfect refer to varying properties but do not encapsulate the essence of porosity itself.