Definition of relative humidity in US English:

relative humidity


  • The amount of water vapor present in air expressed as a percentage of the amount needed for saturation at the same temperature.

    • ‘Weather conditions that favor fungal growth are an average daily temperature below 85°F and relative humidities above 90 percent.’
    • ‘Charts are available that show grain equilibrium moisture for different crops, temperatures and relative humidities.’
    • ‘The average relative humidity was 78 per cent.’
    • ‘A relative humidity of 70 percent or more at the wood surface is ideal for mildew growth.’
    • ‘A relative humidity of 60 percent will alleviate the problem.’
    • ‘There is no requirement for temperature, but the relative humidity in the area should not exceed 70%.’
    • ‘Maintaining a minimum relative humidity of 40% helps reduce water evaporation from the skin.’
    • ‘Measuring the resulting dew point temperature confirmed a relative humidity higher than 30 percent.’
    • ‘The moisture in the breath of visitors could set off the corrosion cycle again, but the system keeps the relative humidity below 40 per cent.’
    • ‘Average relative humidity is around 15 per cent (well below comfort zone levels) and minor earthquakes are common.’