The process where water vapour evaporates from our breath is called?

• A. Transpiration
• B. Evaporation
• C. Condensation
• D. Respiration

Answer: (D)

Breathing is the process that moves air in and out of the lungs and involves gas exchange. The air we exhale is moist and warm because the lungs add moisture to the air as it passes over the lining of the airways. Water vapor leaves the body along with carbon dioxide during this cycle, so the presence of water vapor in our breath is a natural part of respiration. This is different from evaporation, which is a general change from liquid to vapor not tied to breathing, transpiration, which is water loss from plants, or condensation, which is vapor turning back into liquid on a surface. So the phenomenon described is respiration.