If you continue filling up the cup, it will reach 100% RH when it is completely full, and the cup will begin to overflow. Relative humidity can be thought of as a cup filled with water, where the size of the cup depends on the air temperature.įor example, an empty cup would be 0% relative humidity, and if the cup is half-full, we can say the relative humidity is 50%. It depends on the ambient temperature and pressure of the air, as the capacity of air to hold moisture increases with temperature. Relative humidity (RH) is a measure of the air’s ability to hold evaporated water, expressed as a percentage. What is relative humidity and how does it differ from absolute humidity? Based on ASHRAE Standard 55 recommendations, at room temperature (21☌) RH levels should vary between about 30-75% (a dew-point temperature of occupied spaces no less than 2☌, with an upper-limit of 16.8☌ at standard pressure).
Relative humidity outside of these levels can cause physical discomfort, and above 70% can lead to physical damage to the building through condensation. The Canadian Standards Association (CSA) recommends that at a maximum, humidity levels should be between 20-70%. The recommended humidity levels for a healthy and comfortable indoor environment are between 30-60% relative humidity. It is known to support the spread of viruses and infection.
Low humidity can have a huge impact on air quality and occupant health and comfort.
When it is so often damp outdoors, it is easy to think that reducing humidity levels is what needs to be focused on, but it is not only high levels of humidity that should be prevented. High levels of humidity cause mold and condensation issues. In Vancouver, humidity is usually something you try to avoid in a building.
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