relative humidity


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Related to relative humidity: absolute humidity, dew point

relative humidity

[′rel·əd·iv hyü′mid·əd·ē]
(meteorology)
The (dimensionless) ratio of the actual vapor pressure of the air to the saturation vapor pressure. Abbreviated RH.

Relative humidity

The ratio of the amount of water vapor in air to the maximum amount of water that the same volume of air can hold at the same temperature, expressed as a percentage.

relative humidity

The ratio of the weight of water vapor actually in humid air to the maximum possible weight of the water vapor that the air could contain at the same temperature; usually expressed as a percentage.

relative humidity

The ratio of the amount of water vapor in the air to the amount the air can hold at that temperature. This ratio is always expressed as a percentage.
References in periodicals archive ?
Survival, fecundity, and development of Dermatophagoides farinae (Acari: Pyroglyphidae) at fluctuating relative humidity.
Figures la through lc show the impact that different temperatures, relative humidity levels, and ratios of air exchange rate-to-loading factor had on the percentages of VOC components.
Relative humidity (%) exerted negative and non-significant effect on population of aphids however rainfall (mm) which remained mild in the agro climatic conditions of this region and it exerted a positive and significant effect on aphid population (Table III).
Comparing normal indoor and controlled conditions of relative humidity for KLM and SLM samples the compressive strength is attainted more in case of SLM in controlled condition whereas in case of normal indoor condition KLM achieved more strength in comparison to SLM.
Maximum temperature showed significant negative correlation with disease progress in the two late sown conditions (July third week and August first week) while evening relative humidity showed significant positive correlation only in second date of sowing (July third week sowing).
The measured values were recorded every 2 hours from 8 am to 18 pm using the relative humidity and air temperature sensors placed in 7 different locations.
Early humidity sensors used rolled, treated horse or human hair to determine relative humidity.
According to the study, this data projects lower relative humidity in dry zones and--with the anticipated increases in heat-trapping emissions--a higher temperature rise with all its impacts, including sea level rise, heat waves, and droughts.
John Noti and colleagues from the National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, tested the effect of relative humidity on the capacity of flu virus released in a simulated 'cough' to re-infect cells.