Hygrometer

November 1, 2021

If you think that the humidity in your work or home environment is not adequate , you feel that because of the heating your throat becomes very dry or, on the contrary, when you get up you notice that there are drops of water on the window of your laboratory, it is It is important that you start using a hygrometer.

This instrument, also known as the hydrographer, was born from the ingenuity of the wonderful French physicist Guillaume Amontons , who brought an enormous advance both to meteorology and to the different fields of thermometry.

He presented this wonderful laboratory tool in 1687 at the Academy of Sciences; after this he continued researching and publishing interesting papers on thermometry and fiction.

Later came models made by other physicists who managed to perfect it, including the one made during the 18th century by the German Daniel Gabriel Fahrenheit, who was also the inventor of the mercury thermometer.

What is a Hygrometer?

The hygrometer is an instrument that serves to qualitatively measure the humidity that is present in the air of the atmosphere, in plants or in the soil through sensors that indicate and appreciate the variation that can occur in the degrees of humidity.

These values ​​are expressed in%, ranging between 0 and 100%. The amount of relative humidity refers to the ration of water in the gaseous or vapor state existing in the air, with respect to the amount of water that would saturate it at a certain temperature.

The oldest were built with mechanical sensors and allowed responses to elements such as human hair, which is very sensitive to variations in humidity. This is an essential instrument in meteorology , used to measure the humidity of the air and to know if the environment is humid or dry; In addition, you will always see them in air treatment equipment such as humidifiers .

To establish this, the hygrometer is composed of a dry and a wet package that are responsible for providing the data, called a psychrometer. Designed with materials that contract or expand depending on the degree of humidity in the environment, this measurement in turn is accompanied by others such as temperature and pressure.

What is a Hygrometer for?

The environment in which this important tool is used is very varied and wide, it is used both to know how close the bad weather and rains are, as well as for the preservation of products that are usually very sensitive to excess humidity , in different industrial processes that require a little humidity such as the manufacture of silk, paper and certain fabrics.

It is also widely used when you want to have good hygiene, to know the level and quality of humidity in any room or premises. At present they are used in saunas, egg incubators, museums and even to preserve delicate musical instruments made of wood, it is also used in the paint industry, since there are coatings that are very sensitive to humidity.

In meteorology it is used to measure the degree of humidity that is present in the atmosphere, with it it is possible to determine if the levels are very high or moderate.

How does a hygrometer work?

The hygrometer measures the humidity present in a certain area, these devices are based on the use of absorbent materials that, by absorbing the environmental humidity, are lengthened and much more when the air is more humid.

To be able to measure the humidity present in any space, what you must do is hold the hygrometer in the area where you want to perform the calculation, wait a few minutes until the equipment returns a value and it remains stable.

Its operation is based on the presence of lithium chloride mixed with water element that at the moment of absorbing the humidity expands, in the case of electrical appliances the whole set heats up due to electrodes that emanate current, evaporating the water, absorbing the chloride managing to expand and change its volume.

There is in some models the possibility of displaying the measurement in ° C or in ° F , the dew point and the bulb humidity. These devices that are powered electronically can measure humidity using materials that have an electrical resistance, the value of this will vary, depending on the level of humidity it absorbs.

Uses of the Hygrometer

Humidity is extremely significant for our health and comfort , it has been linked to lethargy, irritability, drowsiness and the depreciation of observation activities, but it also plays an extremely important role in heat exhaustion and heatstroke.

This is how the hygrometer becomes an instrument that has multiple uses and is not only applied for the area of ​​meteorology but is also used for:

  • Treatments of respiratory tract diseases.
  • Biomedical applications.
  • Physiotherapy treatments.
  • In industrial spaces.
  • Agricultural research.
  • In museums to keep works of art in good condition.

Keep in mind that low humidity values, when they are less than 30% can be harmful to the body , they can cause an increase in static electricity, irritations, discomfort and even a significant increase in the amount of dust that is suspended in the air.

But increasing these values ​​above 70% is not favorable either , as it will facilitate the appearance of mold, the proliferation of microbes and condensation in cold areas, to avoid both extremes it is important to use a hygrometer, so you will be aware of so much of the humidity present in the environment in which you find yourself and you will be able to take the necessary measures to create a suitable environment.

Types of Hygrometer

The hygrometer is a very precise instrument with a fast response time , the values ​​that it can measure vary from 0% when it is a completely dry environment to 100% when it is a totally humid space such as fog and bathtubs. steam.

There are different types of these instruments, for example:

  • Hair Hygrometer

This hygrometer model contains a group of hair in the shape of a cord, with this, the response of the diversity of changes in humidity that is traced in the air is sought , either by winding or unwinding with less or greater force according to the humidity that there is in the environment.

  • Absorption hygrometer

This works in the environment of chemistry with gaseous and chemical substances that have the ability to separate or absorb moisture found in the environment.

  • Electric hygrometer

It is built with two spiral-wound electrodes, its function is originally based on inorganic substances that manage to separate the water and change its state from liquid to gas by calculating the proportion of moisture in the scattered molecules.

  • Condensing hygrometer

This hygrometer is used to calculate the percentage of humidity in a wide range area , usually it is used on flat surfaces, for example smooth floors or walls.

  • Digital hygrometer

This is the model that performs the calculations through electronic circuits with which it is possible to express in numbers the small voltage alterations that are produced by the variation of some physical properties, measurements that can be observed on the screen. It should be noted that this is the most modern hygrometer.

As you can see, the hygrometer is an indispensable tool , which has endless uses and not only in meteorology, but in the day-to-day life of any person, whether in their home, office or laboratory. It is very important to know the humidity and there is nothing better for this than using a hygrometer to achieve it.

Characteristics of a Hygrometer

The first hygrometers are composed of a U-shaped tube that generally contain sulfuric acid, the condensation ones are based on the transformation of humidity into water through the decrease in temperature, for which sulfuric ether is usually used.

Although there is currently a wide variety of hygrometers, they all have certain characteristics that make them fully functional.

  • Temperature chamber
  • Electricity control
  • Photo-transistor
  • Mirror
  • Refrigerator
  • Double references
  • Light source

Each style will present different elements of course, but all with the purpose of providing the best results.

Importance of a Hygrometer

Having a tool like this is extremely important, since it lies in the evolution of the human being to study climate phenomena and recognize their changes during the different seasons of the year.

The hygrometer has a wide variety of applications, it serves to preserve products that are excessively affected by humidity, determines the proximity of storms and rains, establishes the degree of humidity that is present in certain rooms and premises, as well as the conditions of environments that require a large number of industrial processes, such as the manufacture of silk, paper and fabrics.

It is a tool that needs to be calibrated at least once a year in order to guarantee operation and that the results it provides are as accurate as possible and completely reliable.

Dr. Loony Davis5
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Born and raised in Brussels in an English family, I have always lived in a multicultural environment. After several work experiences in marketing and communication, I came to Smart Water Magazine, which I describe as the most exciting challenge of my career.
I am a person with great restlessness and curiosity to learn, discover what I do not know, as well as reinvent myself daily, someone who is curious about life and wants to know. I enjoy sharing knowledge.
This is my personal project but I also collaborate in other blogs, it is the case, the most important web on water currently exists in the US, if you are interested you can read my articles here.

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