The body’s ability to dissipate the heat and moisture it produces determines which comfort concept?

• A. Thermal comfort
• B. Indoor air quality
• C. Comfort index
• D. Human comfort

Answer: (D)

The body's ability to shed heat and moisture it produces is the physiological basis for human comfort. When metabolism generates heat and sweat, the body must dissipate it through evaporation (sweating), plus sensible cooling by convection, conduction, and radiation. If the surrounding environment supports this cooling—cool or moderate temperatures, balanced humidity, good air movement—the body can maintain a comfortable state. If heat and moisture aren’t dissipated efficiently—high temperature, high humidity, stagnant air—the body overheats or becomes damp and uncomfortable. While related ideas like thermal comfort describe the felt experience of temperature and humidity, the focus here is on the physiological process that underpins how comfortable a person actually feels, hence human comfort.