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Amount Of Water:
Water absorbs a certain amount of free oxygen from the air, but this amount is so small as compared with what the plants produce that it is not important. To cover the aquarium with glass does not reduce the oxygen supply. It does, however, prevent a film of dust and oil from collecting on the water and disturbing the established balance, and it prevents rapid water evaporation.Just one example is sufficient to indicate how enormously the amount of water needed by a field varies with crop, climate and the nature of the soil. Grain crops that are able to flourish on 46cm (18in) of water in one region may require nearly double that amount elsewhere.
Relative humidity is the amount of water vapor in the air, stated as a percentage of the maximum possible amount at that temperature. Because this maximum amount decreases with decreasing temperature, relative humidity increases as temperature falls even though the actual amount of moisture is unchanged. When the relative humidity reaches 100%, and the air is further cooled, some moisture condenses into visible forms. The temperature at which this occurs is the dew point.
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