luftfugtighedssammenhæng

Humidity, in the context of air, refers to the amount of water vapor present. In Danish, luftfugtighed means humidity, and the concept is commonly described using relative humidity (RH)—the percentage of water vapor in the air relative to the maximum amount the air can hold at a given temperature. Other measures include absolute humidity (the mass of water vapor per volume of air) and specific humidity (the ratio of water vapor to total air mass).

Indoor humidity affects comfort and health. Most healthy indoor environments use RH roughly between 30% and 50%. In very dry conditions, people may experience dry skin, throat irritation, and static electricity; in overly humid conditions, there is risk of mold, dust mite proliferation, and condensation on walls and windows.

Humidity influences many practical processes. For buildings, moisture can affect wood, paint, plaster, and electrical components. In agriculture and food storage, humidity governs drying, ripening, and spoilage. In weather, humidity contributes to heat index, fog, and precipitation through the dew point, the temperature at which air becomes saturated and water vapor begins to condense.

Measurement and control: Hygrometers monitor humidity; humidifiers add moisture; dehumidifiers remove moisture; air conditioning and ventilation manage moisture exchange. Effective control relies on insulation, sealing, and adequate ventilation to balance indoor moisture with outdoor conditions.

Humidity is influenced by climate and seasonality. Warmer air can hold more water vapor, so humid summers often require different strategies than dry winters. In climate change contexts, shifts in temperature and precipitation patterns can alter humidity exposure and related health and infrastructure risks.