What is the absolute humidity (AH) in the hypopharynx?

The absolute humidity (AH) in the hypopharynx is typically around 30 mg/L. This measurement refers to the actual amount of water vapor present in a given volume of air, specifically at body temperature, and indicates the level of moisture in the air that is being inhaled and processed by the respiratory system.

At normal body temperature (approximately 37 degrees Celsius), the capacity of air to hold water vapor increases, and the AH in the airways must be sufficient to ensure proper function of the respiratory system and maintain mucosal integrity. Therefore, a value of about 30 mg/L aligns with physiological norms and is recognized as the typical absolute humidity level in the hypopharynx.

This value is vital for respiratory therapists and healthcare professionals to understand, as it impacts how the lungs humidify incoming air and can inform decisions regarding humidification protocols for patients receiving respiratory support.