When a means of communication discloses the temperature, normally, the relative humidity of the air is also informed. But, after all, what is air humidity and what is its importance?
The amount of water vapor in the atmosphere is called air humidity. Values can be expressed in absolute numbers (g/m³) or in relative form (%) to their saturation point. This is one of the elements analyzed for the climatic characterization of a given location.
Among the methods used to measure air humidity are the psychrometer (calculates the evaporation speed of water) and the hygrometer (measures the amount of water present in gases). This data can be obtained through percentages, for example: the relative humidity of the air is 75%. In this case, it means that 25% remains for the air to retain all the water vapor and transform it into a liquid state.
Several factors influence the air humidity, such as temperature, vegetation cover, number of buildings, presence of rivers, lakes, seas, etc. Water vapor present in atmospheric air can trigger fog, mist, dew, frost, etc.
The humidity of the air in a given place directly affects the quality of life of the inhabitants. Low humidity can cause respiratory problems, nosebleeds, dehydration, etc. High humidity, on the other hand, can cause dizziness and proliferation of fungi.
By Wagner de Cerqueira and Francisco
Graduated in Geography
