What is a likely outcome when the vapor pressure in a drying chamber is lower...

The IICRC WRT body of knowledge explains that moisture movement is governed byvapor pressure differentials. When the vapor pressure within wet materials is higher than the vapor pressure of the surrounding air, moisture naturally migrates from the materials into the air. This condition is essential for effective drying.

A drying chamber with lower vapor pressure than the wet materials creates the necessary driving force for evaporation. The WRT manual emphasizes that this differential is achieved by reducing humidity ratio through dehumidification and increasing temperature and airflow at the material surface.

If the opposite condition exists—where air vapor pressure is higher than material vapor pressure—moisture can migrate into materials, causing secondary wetting. Therefore, maintaining lower vapor pressure in the air than in the materials is a core objective of restoration drying systems.

The class or category of water does not change due to vapor pressure alone; those are classification concepts based on absorption and contamination. The correct outcome under WRT science is moisture migration from materials into the air.