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There are many instruments for measuring relative humidity. Which of the following statements are correct with respect to these devices? I. The hygrometer uses a tuft of human hair to measure relative humidity. II. Psychrometers are a pair of thermometers.

There are many instruments for measuring relative humidity. Which of the following statements are correct with respect to these devices? I. The hygrometer uses a tuft of human hair to measure relative humidity. II. Psychrometers are a pair of thermometers. Correct Answer Both I and II

Relative Humidity is the amount of water vapour in the air as a percentage of the amount required for saturation at the same temperature.  Important Points

  • Hygrometer:
    • Leonardo da Vinci created a crude hygrometer around 1480.
    • Francesco Folli made tremendous progress and built a functional apparatus model during the 1600s.
    • Robert Hooke was also responsible for key advancements in the hygrometer's technology.
    • Johann Heinrich Lambert, a Swiss polymath, created a more complete version in 1755.
    • In 1783, Swiss physicist and geologist Horace Bénédict de Saussure constructed the world's first hygrometer, which used human hair to calculate humidity.
  • Psychrometers: 
    • is essentially a hygrometer.
    • It is made up of wet-bulb and dry-bulb thermometers.
    • The difference in the two thermometer readings is used to determine atmospheric humidity.

Hence, both statements I and II are correct in respect to measuring instruments of relative humidity.

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