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    The instrument that measures and records the relative humidity of air

    The instrument that measures and records the relative humidity of air is a) Hydrometer b) Hygrometer c) Lactometer d) Barometer


    The instrument that measures and records the relative humidity of air is

    A. Hydrometer B. Hygrometer C. Lactometer D. Barometer

    Answer: Option B

    Solution(By Examveda Team)

    A hygrometer is an instrument used to measure relative humidity. Humidity is the measure of the amount of moisture in the air. A psychrometer is an example of a hygrometer.

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    The instrument that measures and records the relative humidity

    The instrument that measures and records the relative humidity of air is

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    The instrument that measures and records the relative humidity of air is

    Hydrometer Hygrometer Lactometer Barometer

    Correct Option: B

    A hygrometer is an instrument used for measuring the moisture content in the environment. Humidity measurement instruments usually rely on measurements of some other quantity such as temperature, pressure, mass or a mechanical or electrical change in a substance as moisture is absorbed. By calibration and calculation, these measured quantities can lead to a measurement of humidity. Modern electronic devices use temperature of condensation, or changes in electrical capacitance or resistance to measure humidity changes. Besides greenhouses and industrial spaces, hygrometers are also used in some incubators (egg), saunas, humidors and museums.

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    hygrometer, instrument used in meteorological science to measure the humidity, or amount of water vapour in the air. Several major types of hygrometers are used to measure humidity. Mechanical hygrometers make use of the principle that organic substances (particularly finer substances such as goldbeater’s skin [ox gut] and human hair) contract and expand in response to the humidity. Contraction and expansion of the hair element in a mechanical hygrometer causes the spring to move the needle on the dial. Electrical hygrometers measure the change in electrical resistance of a thin layer of lithium chloride, or of a semiconductor device, as



    Written and fact-checked by The Editors of Encyclopaedia Britannica

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    Rolamite, mechanical roller-band device that functions as an almost frictionless suspension system for rollers; it consists of a flexible metal band formed in an S-shaped loop. In the Figure, rollers A and B are suspended within the loops of the flexible metallic band C, fastened at D and E to the parallel guide rails F and G. The sum of the roller diameters and twice the band thickness is greater than the distance between the guide rails, so that when the band is pulled taut and anchored to the guide rails at D and E, the band is wrapped around the rollers so tightly that slippage is prevented. If the guide rails in the figure were tilted clockwise slightly, roller A would rotate counterclockwise and roll out the band on the upper guide rail to some position such as A′, and roller B would rotate clockwise and roll in the band on the lower guide rail to position B′. The frictional forces restraining the motion of the rollers would be about one-tenth the friction for ball and roller bearings.

    The Rolamite was invented in 1966 by the U.S. engineer Donald F. Wilkes, who gave it its name.

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