Difference between Humidity and Relative Humidity

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Difference between Humidity and Relative Humidity

Hello Friends, Todays topic is Difference between Humidity and Relative Humidity or humidity vs relative humidity below is complete information with table.

Difference between Humidity and Relative Humidity

It has been a Subject of confusion to know difference between humidity and relative humidity.

The important factor that affects the pharmaceutical products quality is Relative humidity.

In the areas/department like granulation and compression, It is important to control the humidity.

Both humidity and relative humidity measures the amount of water available in the air but both humidity vs relative humidity have different method of measurement.

Humidity in air depends upon the season of the year and the atmosphere of the area.

In the dry areas such as desert, the humidity remains very low but humidity remains very high in the area close to ocean and rain forest.

Humidity

Humidity is higher in the rainy season and less in the summer season. Air can only hold limited quantity or amount of water vapours or moisture. When the moisture increases above certain limit, moisture turns into droplets which are called as fog.

Humidity is the amount of water or moisture present in the air in the form of water vapours.

It is measured as total mass or weight of water vapours present in given volume of sample, which is mass/volume. So Mass/Volume is also called as absolute humidity.

The Unit of Humity is (g/m3) or (g/kg).

Absolute humidity

It is the total amount of water vapour contained in a given volume of air. Water vapour is measured in grams and air vapour in m3. The absolute humidity, then, we will expose it in grams of water vapour per cubic meter of air.

Specific humidity

Actually, it is the same analytical phenomenon as absolute humidity, only the type of measurement is changed. In the case of the specific one, the calculation is made in kilograms of water per kilograms of dry air. As with absolute humidity, specific humidity accounts for water as vapour.

Humidity vs Relative humidity

RH

It is the relationship between the amount of water vapor contained in the air -which is the absolute humidity- and the maximum amount of air that it can hold at that temperature, taking into account the absolute humidity of saturation. Relative humidity is a calculation that is given as a definitive percentage value.

At a general level, only relative humidity is usually taken into account for its ease of reading. Although the absolute and the specific calculation are the most precise technical values, they are more difficult to understand because they are not so easy to understand.

Relative Humidity

The percentage of the moisture against the highest possible level of moisture in the air at a specific temperature is called as relative humidity.

Relative humidity is measured higher at less or lower temperature because cool/cold air holds/traps more water vapours than the hot/warm air. Relative humidity is measured by an instrument called hygrometer and also denoted as %RH.

E.g.:

  • If air of any area has half of the water vapours that it can carry its relative humidity would be 50 %.
  • 100 % is the highest and 0 % is the lowest value of relative humidity that can be found in any area.

Relative humidity: Relative humidity understands that the maximum value is 100%, so it is easy to memorize when we have high humidity, which will be when the indicative percentage is very high. But it is that in addition to that the human body is only sensitive to relative humidity and not to the specific or absolute.

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During Summers temperature is very high, Also the changes in how we feel on our skin the change of season, the differences in the sensation of heat and even the appearance of colds. Relative humidity and absolute humidity are involved in all these phenomena, which are not only noticeable outdoors. Indoors, excess water vapour in the air also has a lot to do with our day to day life.

We must bear in mind that, in Spain, the situation that usually occurs is that of an excess of humidity. Although we enjoy dry and humid climates, the high temperatures in Spain and its geographical location make it a country that does not usually suffer from low humidity. The areas where there may be a greater impact is in the coastal areas or where there is a large concentration of water.

Indoors, we have to control the values of relative humidity and absolute humidity. Because in our home an excess of humidity can translate into different problems:

  • Respiratory complications for the people who live in the house.
  • Appearance of diseases such as asthma or allergies.
  • Greater sensation of heat indoors and high sweating.
  • Defects in the walls and ceilings and also in the furniture.

ASTHMA is Caused By?

We can say that humidity affects our comfort and also our environment. It is very common to hear the concepts of absolute humidity and relative humidity, in addition to that of specific humidity. However, which of them will matter more to us to understand the importance of this phenomenon, which is the condensation of water vapour in the air? We detail it.

Why do we have to worry about relative humidity and not absolute humidity?

Air will influence all of us differently depending on relative humidity. If the humidity value in percentage is very low, the air will dry out us and also the objects and the rest of the environment. If, on the other hand, the relative humidity is very high and approaches one hundred percent, it will be the other way around: it will transfer the humidity to everything it touches.

That is why the relative value of humidity is what we must take into account at all times to know if it will affect us in one way or another. The absolute and specific humidity, on the other hand, will be used to calculate the percentage in the environment.

Which value of relative humidity will be the most beneficial for all of us? We can calculate that the ideal humidity value would be between 40% and 60%. If a value is given below 40% -which is more difficult in Spain due to its orography and particular climatology- it would be necessary to use humidifiers or other solutions to be able to increase the humidity.

In the event that the relative humidity is very high, it would be necessary to try to reduce the value by using dehumidifiers. Since in that case health problems and deterioration of the interiors could arise. In order to calculate the level of relative humidity, we can use humidity detectors, which for an economical price indicate the specific value at all times indoors.

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