What does "vapor carried" refer to?

"Vapor carried" refers to the movement of air containing water vapor, which is a crucial aspect in understanding how moisture can migrate within a building. This concept is significant in building science as it impacts the air quality and the potential for condensation, mold growth, and other moisture-related issues.

Air movement or diffusion is essential for maintaining a balanced indoor environment. As warm air can hold more moisture than cool air, when warm air carrying vapor comes into contact with cooler surfaces, the vapor can condense, potentially leading to structural damage and indoor air quality problems. Therefore, recognizing vapor movement helps in designing buildings that minimize such risks.

The other options, while relevant to the areas of fluid dynamics and thermodynamics, do not specifically address the context of vapor transport in air. Water movement in liquid form pertains to liquid water instead of vapor, gas pressure in a closed space relates to pressure differentials rather than the dynamic behavior of moisture, and heat transfer deals with thermal energy movement rather than the migration of vapor specifically.