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English: This chart represents the acceptable combination of air temperature and humidity values, according to the PMV/PPD method in the ASHRAE 55-2010 Standard. The representation is made on a temperature-relative humidity, instead of a standard psychrometric chart.
The main feature of thermodynamic diagrams is the equivalence between the area in the diagram and energy. When air changes pressure and temperature during a process and prescribes a closed curve within the diagram the area enclosed by this curve is proportional to the energy which has been gained or released by the air.
Chilling air increases the relative humidity. If the relative humidity rises over 100% (the dew point) and there is an available surface or particle, the water vapour will condense into liquid or ice. Likewise, warming air decreases the relative humidity. Warming some air containing a fog may cause that fog to evaporate, as the droplets are ...
Vapour pressure-deficit, or VPD, is the difference (deficit) between the amount of moisture in the air and how much moisture the air can hold when it is saturated. Once air becomes saturated, water will condense to form clouds, dew or films of water over leaves. It is this last instance that makes VPD important for greenhouse regulation. If a ...
The amount of light required depends on the species; overall, air plants with silver dusting and stiff foliage will require more sunlight than air plants with softer foliage. They generally need a strong light. In summer outside, however, they prefer the light shade of a tree at the hottest hours.
When the air is cooled below the dew point, its moisture capacity is reduced and airborne water vapor will condense to form liquid water known as dew. [2] When this occurs through the air's contact with a colder surface, dew will form on that surface. [3] The dew point is affected by the air's humidity. The more moisture the air contains, the ...
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At a constant relative humidity of air, the EMC will drop by about 0.5% for every increase of 10 °C air temperature. [2] The following table shows the equilibriums for a number of grains (data from [1]). These values are only approximations since the exact values depend on the specific variety of a grain. [2]