Watercress is fun and easy to grow at home. Take a look at our article showing you how to use the grocery store watercress to start your own patch of watercress at home. Hydroponic Water Cress. This is an image of commercially hydroponically grown watercress.
Fog is the extreme of humidity. Humidity control systems add or remove water vapor from indoor air to stay within proper humidity ranges. Humidity control is important for three reasons: 1  It is a large factor in people's thermal comfort.2  Excess moisture in a building can lead to mold and mildew, causing problems for indoor air quality.umidity control systems add or remove water vapor from indoor air to stay within proper humidity ranges. Humidity control is important for three reasons: 1  It is a large factor in people's thermal comfort.
Cooling Moist Air-Sensible Cooling. If the temperature on a cooling surface-tC-is above or equal to the dew point temperature-t DP-of the surrounding air, the air will be cooled without any change in specific humidity. m3/s of air at 30 oC and relative humidity 60% (A) is cooled down to 15 oC (B). The surface temperature of the cooling coil is 0 oC (C). The density of air at 20 oC is 1.205 kg/m3.