Human hair has a characteristic that it absorbs the amount of water vapor in the air as the relative humidity increases, and the length of the hair is related to the amount of water it contains. Normal hair can stretch about 20% when dry, and about 40% when wet. A hair hygrometer can be made using this change. Wash the hair with alcohol, etc., and fix one end of the hair, and hang a small weight on the other end. In order to see the change of the length of the hair, the hair is bypassed by a pulley and the pulley is placed on the pulley. Long pointer. Due to the weight of the weight itself, the hair is pressed tightly on the pulley. When the hair is stretched, the pulley rotates clockwise and causes the pointer to deflect downwardly in an arc, and when the hair is shortened, the pointer rotates upward. When the air is completely dry, the position pointed by the pointer is zero. When the water vapor in the air reaches saturation, the point indicated by the pointer is counted as 100, and then the ventilator is used to check the degree, so that the relative humidity of the air can be directly measured. The advantages of the hair hygrometer are high precision, good quality and low price.
Beijing Jiuzhou Space Science & Trade Co., Ltd. specializes in the production and sales of online soil erosion monitors, portable surface runoff automatic monitors, small watershed sediment automatic monitors, small-diameter sediment automatic monitors, steel ruler water level gauges, automatic rainfall stations, Portable flow meter, portable weather station, soil nutrient speed meter, gas sampling cylinder and other products, welcome new and old customers to come to consult
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