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.
Humidity is one of the two most basic of weather variables (the other being temperature) and all of us are interested in what they are right now and what they will be in the future. Hygrometers are able to measure the humidity or amount of moisture (water vapor) in the air. By knowing the percentage of humidity in the air along with the current temperature, dew point temperature and heat index can be calculated. These factors can be important to those who work and play outside.