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.
Part 1 of 4: Buying a Humidity Meter (Hygrometer). 1. The easiest way to measure humidity is to buy a Hygrometer. Hygrometers measure humidity from 0% (dry) to 100% (when any more moisture comes out as precipitation or fog.). 1  Relative Humidity (RH) can change throughout the day.2  Colder air holds less moisture, so the RH level will normally be higher at night.3  This is why Air Conditioned environments tend to be so dry.art 1 of 4: Buying a Humidity Meter (Hygrometer). 1. The easiest way to measure humidity is to buy a Hygrometer. Hygrometers measure humidity from 0% (dry) to 100% (when any more moisture comes out as precipitation or fog.). 1  Relative Humidity (RH) can change throughout the day.