| There is a water vapor content of the air can reflect a device called the wet and dry bulb hygrometer. It is composed of two identical thermometers made in parallel, wherein a thermometer is wrapped a damp cloth. Two readings are not the same as the thermometer, two dry bulb thermometer bulb thermometer exposed to the air, the air temperature is displayed i.e. room; bulb wet bulb thermometer is wrapped in a damp cloth, because the endothermic evaporation of water in a wet cloth, so wet bulb thermometer dry-bulb thermometer shows the number is less than the number of shows. Day and more dry air, the faster the evaporation, the more endothermic the number the larger the difference of two thermometer shown; on the contrary, the more the greater the moisture vapor that is, the slower the evaporation of the air, the number two smaller difference thermometer shows, the Number two differential thermometer reflects the content of water vapor in the air. |
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