What is the temperature of breath leaving the body?

What is the temperature of breath leaving the body?

• A. 37 Degrees Centigrade
• B. 25 Degrees Centigrade
• C. 40 Degrees Fahrenheit
• D. 40 Degrees Centigrade

Answer: (D)

Breath leaving the body is warm and humid because it has been heated and moistened by the respiratory tract. The air is brought to near body core temperature, so exhaled air typically falls in the mid-30s Celsius. In practice that means around 34–37°C. Among common options, 37°C best matches the actual breath temperature. The other choices are either too cool, too hot for the body, or in a unit (like 40°F) that doesn’t correspond to typical exhaled air.

Breath leaving the body is warm and humid because it has been heated and moistened by the respiratory tract. The air is brought to near body core temperature, so exhaled air typically falls in the mid-30s Celsius. In practice that means around 34–37°C. Among common options, 37°C best matches the actual breath temperature. The other choices are either too cool, too hot for the body, or in a unit (like 40°F) that doesn’t correspond to typical exhaled air.