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

In ancient times, people did not reliably know 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.

Properties of dew in the beliefs of the Slavs. Healing opportunities

Surprisingly, there were many beliefs related to 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 in the treatment 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 restored very quickly, 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: it is 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 clouds 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, a concept is also associated, such as the dew point. Who remembers from the school course, the temperature of the dew point is the temperature value of the gas at which the water vapor contained in the gas is cooled isobarically and becomes saturated over a flat water surface. Simply put, this is the value to which the air temperature should drop. 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 surface of the grass during the time when the earth gives energy to the 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 one way or another. 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 the evening after a hot day appears dew. It was the "hot day". Is this condition 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 in the daytime from the sun's rays begins to leave the earth intensively. In the most rapid 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 without the intervention of scientists. For example, the way dew appears was a kind of hydrometeorological center, according to which people could predict the weather the next day. Condensate, which falls late in the evening, 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 day appears dew, it seems, everything is clear. But it's funny that the same process creates two unique and beautiful phenomena in nature. In the warm season he gives us dew, and in the cold season - he covers everything with frost. 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 lies in the fact 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 easy as it seems at first glance, but this is a topic for a completely different conversation.