Humidity measurements refer to the quantification of moisture content in the air. This is typically expressed as a percentage, indicating the amount of water vapor present compared to the maximum amount the air can hold at a specific temperature. Common instruments used for measuring humidity include hygrometers and psychrometers. Understanding humidity is essential for various fields, including meteorology, agriculture, and HVAC (heating, ventilation, and air conditioning) systems. High humidity can lead to discomfort and mold growth, while low humidity can cause dry skin and respiratory issues. Accurate humidity measurements help in managing these conditions effectively.