The amount of moisture in the air is defined as which term?

• A. Moisture
• B. Damp
• C. Humidity
• D. Summer Solstice

Answer: (C)

Humidity is the term that describes the amount of moisture in the air. It refers specifically to water vapor present in the atmosphere. In practice, humidity is often expressed as relative humidity—the percentage of water vapor in the air relative to the maximum amount the air can hold at that temperature. This is the useful measure for understanding how moist the air feels and how it affects comfort and building performance. The other options don’t fit: moisture is a general word for water content, damp is a condition of moisture that has caused wetness, and the Summer Solstice is a solar event with no relation to air moisture.