![]() The moisture will be given up as dew or ice crystals. If partly saturated air is cooled without changing its pressure or amount of water vapour, a point is reached when it becomes saturated. If the dry and wet bulb temperatures are set to the same value the calculator will show the saturation mixing ratio the amount of water in saturated air at that temperature. ![]() If the air is fully saturated (100% relative humidity) the water cannot evaporate, so both the wet and dry bulb temperatures are the same. The depression in Wet-Bulb temperature allows the humidity to be calculated. Since evaporation takes up heat, the thermometer will cool to a lower temperature than a thermometer with a dry bulb at the same time and place. A wet cloth is placed over the bulb of a thermometer and then air is blown over the cloth causing the water to evaporate. We can use evaporation to measure the amount of moisture in the air. The relative humidity of the air is the ratio of the actual amount of moisture in the air to the fully saturated amount. When air at a certain temperature is saturated it cannot hold any more moisture. The actual amount of moisture known as the mixing ratio is measured in grams of water per kilogram of dry air. The air temperature is measured with a normal thermometer this is the Dry-Bulb reading. The warmer the air the greater the quantity of water vapour it can contain. The amount of moisture air can hold is dependent on its temperature and pressure.
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