What defines a porous surface?

A porous surface is defined by its ability to absorb moisture. This characteristic means that the material has small holes or spaces within it that allow liquids and gases to pass through or be absorbed. Porous surfaces include materials like concrete, wood, and fabric, which can take in moisture from their environment. This property is important in various fields, including forensic science and evidence collection, as it affects how evidence, particularly biological or chemical samples, can be preserved and analyzed.

In contrast, surfaces that reflect moisture do not absorb it, while a smooth surface does not necessarily indicate porosity. Additionally, surfaces that are impervious to liquids cannot absorb moisture, defining them as non-porous. Understanding the nature of porous surfaces is crucial for evidence technicians, as it influences the method of collecting and preserving evidence found on such surfaces.