Relative Humidity Measurement

In this article we ll go over the five different units that you need to learn and we ll explain why relative humidity is the most useful.

Relative humidity measurement.

Relative humidity is an important metric used in weather forecasts and reports as it is an indicator of the likelihood of precipitation dew or fog. A higher percentage means that the air water mixture is more humid. Your hygrometer will give you a percentage level of humidity. Industrial manufacturing drying processes and climate chambers.

In hot summer weather a rise in relative humidity increases the apparent temperature to humans and other animals by hindering the evaporation of perspiration from the skin. The relative humidity or of an air water mixture is defined as the ratio of the partial pressure of water vapor in the mixture to the equilibrium vapor pressure of water over a flat surface of pure water at a given temperature. For example if the screen or the arrow shows a reading of 85 then the relative humidity level is 85. Compared to relative humidity dew point is frequently cited as a more accurate way of measuring the humidity and comfort of the air since it is an absolute measurement unlike relative humidity.

But what exactly is relative humidity you ask. Just about everyone knows that it refers to the amount of moisture in the air but you re a lot less likely to find someone who understands the different humidity measurement units. For full specifications information technical details and ordering information about rotronic relative humidity measurement products please refer to the sections below. The relative humidity is 100 percent when the dew point and the temperature are the same.

Humidity is the amount of water vapor water that has turned from a liquid to an invisible gas in the air. Relative humidity refers to the amount of water vapor present in the air and is expressed as a percentage. Absolute humidity is the actual amount of water vapor in a specified volume of air relative humidity is the ratio of moisture in the air as compared to the maximum amount of moisture the air can hold which varies depending on the air temperature. Rotronic hygroflex5 ex is atex certified probe zone 0 20 transmitter zone 1 21 to provide accurate temperature and relative humidity measurement in hazardous areas.

These devices have been used for more than 100 years to measure the moisture content or relative humidity in the air. Humidity can be a complex topic to understand. While relative humidity can be measured with a hygrometer most modern dehumidifiers use a built in humidistat to measure relative humidity levels allowing the user to set a specific desired humidity level for easy automatic and hands free operation.