In meteorology, the hygrometer is commonly used , since it is capable of quantifying the humidity in atmospheric air or any other gas. This is used to carry out its measurement through sensors that were initially of a mechanical type and that over the years, has been in constant evolution until it is a sophisticated instrument.

What is the Hygrometer?

It is a device that is used to measure air humidity, in meteorology it is applied to quantify the level of humidity that occurs in the earth’s atmosphere.

  • Definition of hygrometer
  • features
  • Source
  • Who invented it
  • What is it for
  • Types
  • Parties
  • How a hygrometer works
  • Calibration
  • Importance

Definition of hygrometer

It is an instrument that, through digital or mechanical sensors, quantify different variants of inorganic substances, both chemical and physical.


  • Quantify the absolute humidity and amount of saturation.
  • Amount of water vapor contained in the air.
  • Amount of water vapor that is at a certain temperature and pressure.
  • Local air humidity.
  • Local temperature humidity.
  • Outside air temperature.
  • Dew point temperature.


The  first hygrometer was  born from the ingenious mind of the French physicist  Guillaume Amontons . He presented it in  1687  to the Académie des Sciences . After that, he continued his research and published articles and documents on friction and thermometry .

Who invented it

The first hygrometer was created by the French physicist Guillaume Amontons born in Paris on August 31, 1663. He was a physicist and inventor who contributed a great advance to meteorology and the different fields of thermometry as well as the author of his book: ” Remarques et experiences physiques sur la construction d’une nouvelle clepsydre, sur les barometees, les thermometres et les hygrometres ” , from the year 1695.

What is it for

It serves to measure or quantify the degree of humidity in the air, soil and plants, as well as the recognition of the different gaseous states of matter.


Among its variants over time, here are the most relevant:

  • Hair hygrometers: It consists of the grouping of hair in the form of a cord, to seek response from the variety of changes in humidity that is registered in the air, either twisting or untwisting.
  • Absorption hygrometer: This type of hygrometer works in the field of chemistry with liquid and gaseous substances, which have the ability to absorb or separate humidity from the environment.
  • Electric hygrometer: It has its functionality in inorganic substances that separate water and change its state from liquid to gas by measuring the percentage of moisture in the scattered molecules.
  • Condensation hygrometer: This meter is applied for the percentage of humidity finding in a wide range area where it is generally used on flat surfaces, be it smooth walls or floors.


The parts that make up this instrument are:

  • Electricity control
  • Fridge
  • Temperature chamber
  • Mirror
  • Light source
  • Photo-transient
  • Double references

How a hygrometer works

For the optimal function of a hygrometer, the calibration and calculation of the same must be applied and the area to be worked on must be known.


The calibration of a hygrometer explains the technique that allows access to minimize or, failing that, eliminate the error in quantifying the relative humidity of the environment. To achieve a good calibration the user has to modify the default readings of the device.


The importance of this tool lies in the evolution of the human being to recognize the climatic changes of the different seasons of the year and study the phenomena of the same in favor of science.

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