High relative humidity can affect human comfort by making the air feel _____ than it actually is.

High relative humidity affects human comfort primarily by making the air feel hotter than it actually is. When humidity is high, sweat does not evaporate as efficiently from the skin. Since evaporation of sweat is a key mechanism the body uses to cool itself, this reduced evaporation increases the perceived temperature, leading individuals to feel hotter.

When relative humidity is low, sweat evaporates quickly, providing a cooling effect and helping to regulate body temperature. However, in conditions of high humidity, the cooling process is compromised, ultimately resulting in discomfort due to the body’s inability to effectively dissipate heat. Therefore, the correct answer highlights the impact of high humidity on how temperature is perceived in relation to actual conditions.