Humidity is defined in three ways: absolute, relative, and specific. Commercial devices, like those found in clocks, typically measure relative humidity (RH) as a percentage, indicating the ratio of current water vapor to the maximum possible at a given temperature. Percentages of relative humidity cannot exceed 100%, as this would indicate saturation, often leading to precipitation in non-tropical climates. In tropical regions, relative humidity can reach 95-100% without rain, creating uncomfortable conditions. The measurement of humidity is influenced by air temperature and pressure, highlighting the significant capacity of air to hold moisture.
