Why does dew appear in the evening after a hot day? Basic conditions for its appearance

In ancient times, people were not reliablyIt is known from where and why dew appears in the evening after a hot day. This was even given divine significance. In principle, this trend affected all events that a person could not explain.

The properties of dew in the beliefs of the Slavs. Healing opportunities

Surprisingly, there were many beliefs,associated with the incredible benefits of this very dew. Many said that it is very useful to walk in the morning barefoot on the grass covered with this moisture. Moreover - in the morning they took out the sick and laid them on the cold dew.

To use the healing properties of dew attreatment of diseases, it was collected in a jar and taken to an empty stomach. Surprisingly, many diseases went nowhere, they simply disappeared: eyesight was restored, wounds healed faster. It was believed that it has the energy of the earth, the maternal energy. Thoughts about why dew appears on the grass were uninteresting; this phenomenon was explained by divine intervention. More interested in its medicinal properties. Probably, and now in villages or small settlements you will hear that the swollen feet in the morning are very quickly restored if you walk barefoot on the grass.

The explanation of the appearance of dew from a scientific point of view

But the era of science has come, and it is clear and simple explained this phenomenon - figured out where the dew comes from and why it happens.

The definition of the phenomenon is as follows: these are some small drops of condensed moisture that settle on plants or soil during the onset of coolness in the morning or evening. What do you need to create dew? It is necessary that there was a warm day, after sunset there was no cloud and the sky was clear, and also a favorable terrain - a surface that could easily give off heat.

The dew point is a bit of physics from school years

With this concept in physics is also associated withconcept as a dew point. Who remembers from the school course, the temperature of the dew point refers to the value of the gas temperature at which the water vapor contained in the gas is cooled in an isobaric manner and becomes saturated above the flat surface of the water.

Simply put, this is the value to whichto lower the temperature of the air. Then the condensate will form from the moisture. The temperature and humidity readings are very important. The higher the humidity, the higher the temperature of the dew point. At lower humidity, reaching the dew point will be more difficult.

Tears of angels or plain water?

The question of why dew appears in the evening after a hot day already contains half the answer. What was given such a high, spiritual, divine significance, was an elementary condensation.

This is water that condenses on the surfacegrass during the time when the earth gives energy of heat to space at night. Naturally, not every water that appears on the surface of green plants in the morning in the summer is dew. Other atmospheric phenomena associated with moisture, such as rain (for warm seasons), can leave wet marks on the ground. The difference is that the rain condenses in the high layers of the atmosphere, when the formation of dew occurs right above the surface of the earth.

Hot weather is one of the first important conditions for the formation of dew.

Moisture in the air is always present, in that orto a different extent. And the higher the humidity, the probability of morning dew and its abundance is also higher. As stated earlier and as seen in the question of why dew appears in the evening after a hot day. It was the "hot day". Is this important?

Certainly. An important role is played by temperature drop. Sharp thermal radiation in the evening, when the sun sets, begins to occur in an active way. That is, the heat that was received by day from the sun's rays begins to leave the earth intensively. In the fastest way, this occurs on grassy glades, and therefore the grass in the fields is often covered with dew.

How to determine the weather with the help of dew?

But nevertheless, despite the simple explanation from the point of view of science, people still competently used this phenomenon and without the intervention of scientists.

For example, the way dew appears was somehowhydrometeorological center, according to which people could predict the weather the next day. Condensate, which falls out late at night, disappears before the sun goes down, at dawn; this indicates that the day will be sunny, clear. At the same time, with absolute certainty, we can say that there will not be any precipitation on such a day. It is interesting that there are different types of dew, but it is the one that falls in our latitudes that can give such a definition of the weather.

Dew in the cold season

With that, why in the evening after a hot dayappears dew, it seems, everything is clear. But it's funny that the same process creates two peculiar and beautiful phenomena in nature. In the warm season he gives us dew, and in the cold season - he covers everything with hoarfrost.

To create this miracle, we also need our own conditions,but, in principle, the process is similar to how dew appears on the grass. The difference is that this condensate is subject to low temperatures, which is why it appears in the frozen state before the human eye. His appearance is not so simple as it seems at first glance, but this is a topic for a completely different conversation.