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.
Relative humidity is the ratio between how much water vapor is in the air and the maximum amount of water that can be held in the air. The maximum amount of water vapor that air can hold varies with the temperature of the air. As the temperature of the air increases, it is able to retain more water vapor.When the interior air comes in contact with the colder window surface the air temperature drops and it is unable to hold as much water, this causes the excess water to accumulate onto the window surface.ondensation is the accumulation of water vapor changing to liquid water onto a surface. When the interior temperature is warmer than the window surface, there is a chance that condensation will form.