Refrigeration Plant Operator B Practice Test

What does higher relative humidity cause in terms of measured temperature?

1. Reduces the perceived temperature

2. Increases the perceived temperature

3. Has no effect on perceived temperature

4. Only affects heating systems

The correct answer is: Increases the perceived temperature

Higher relative humidity increases the perceived temperature primarily due to the way humidity affects the body's ability to cool itself through the evaporation of sweat. When the air is saturated with moisture, the evaporation process slows down, making it more difficult for the body to regulate its temperature. This results in the sensation that it is warmer than the actual measured temperature. Therefore, in conditions of high humidity, people may feel hotter, which is why the perceived temperature increases even if the actual air temperature remains constant. It's important to note that the measurement of temperature does not change in physical units; rather, the way individuals experience heat is altered by the moisture content in the air. This concept is essential for understanding comfort levels in indoor environments and assessing heat stress in outdoor conditions. The other options do not accurately capture the relationship between humidity and perceived temperature.