¡¡Source: thermometer, Candy thermometer, Plastic thermometer, Wooden thermometer- Ningbo Yinzhou Hongxiang thermometer factory
¡¡Also known as wet and dry thermometer of dry and wet. Endothermic water evaporation to cool down, and the speed of evaporation (that is, the number of cooling) is the relative humidity of the air time on this principle made. Is constructed of two thermometers, one in the bulb with white cloth, and dip the other side of the gauze in the tank, that is, by capillary action so that to keep moist gauze, that is, wet-bulb. Another did not open with gauze bag and put the thermometer in the air, it means that a dry-bulb (dry-bulb temperature means that the temperature). If the amount of water vapor in the air not saturated, wet-bulb will continue to surface water evaporation and heat of vaporization lessons, so that by the wet-bulb dry-bulb temperature than indicated lower. More dry air (that is, the lower humidity), the faster the evaporation, and continuously absorb the heat of vaporization, so that wet-bulb temperature, as shown, but the difference between dry-bulb increased. In contrast, when the air was saturated amount of water vapor, the water will not evaporate, nor drawing heat of vaporization, wet bulb and dry-bulb temperature, as shown, will be the same. Use, should be placed away from the wet and dry ground of 1.2 ~ 1.5 m in height. Read out the dry and wet two temperature difference indicated by the hygrometer can be attached table to identify the relative humidity of the air at that time. Because the wet-bulb package of gauze by the speed of evaporation, not only at the time and the relative humidity of the air, but also the flow and speed of the air. Therefore, the ball of wet and dry thermometer attached table applies only to specified wind speed, the application can not be arbitrary. For example, as shown in the thermometer stem the bubble temperature is 22 ¡æ, the wet foam is directed by the thermometer 16 ¡æ, the temperature difference between the bubble is 6 ¡æ, can be shown in the table in his party to find the temperature 22 ¡æ, and his party in the temperature found 6 ¡æ, then 22 ¡æ horizontal and vertical line 6 ¡æ alignment, find the value 54. It means that the relative humidity is 54%.
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