What is relative humidity?

Relative humidity is defined as the ratio of the actual amount of water vapor present in the air to the maximum amount of water vapor that the air can hold at a given temperature, expressed as a percentage. This measurement indicates how close the air is to being fully saturated with moisture.

Understanding this concept is critical in environmental health, as relative humidity affects not only comfort levels for individuals but also the rates of various health-related issues, such as respiratory problems and the growth of mold and mildew. It highlights the balance between moisture in the air and temperature, demonstrating how warmer air can hold more water vapor than cooler air. By knowing the actual water vapor and how much the air can hold, one can assess and predict weather patterns, indoor air quality, and manage environmental conditions effectively.