How beautiful and elegant flowers look in the garden, covered with water droplets, this is dew. But dew does not always appear, but only when some initial conditions coincide, depending on what the weather is like. Let's see under what conditions dew can form.

Dew is liquid water droplets that condense from wet gas on cooled surfaces.

Condensation is a transition from a gaseous state of a substance to a liquid.

The dew point is the maximum air temperature at which moisture in the air, in the form of gaseous vapor, begins to condense into dew. The more moisture in the air, the less the difference in air temperature and dew point, the less - the greater.

In order to quantitatively describe the moisture content in the air, the concept of relative humidity is used.

Thus, dew can occur when the air is humid enough, that is, has a high relative humidity, and when the temperature of the surface on which the dew is to fall is low enough, that is, below the dew point.

When the air cools, the water vapor in it, condensing on objects with a lower temperature near the ground, turns into dew drops.

Dew usually forms at night, because at night the Sun stops heating the earth and objects on it, and they themselves begin to cool due to thermal radiation.

In many places, the weather is not happy with precipitation and dew is an important resource for plants, thanks to which they receive the moisture they need, dew forms on their leaves, which are easily cooled at night, and flows down under the influence of gravity, it feeds their roots.

Dew is most intense in tropical regions, where the air itself is very humid.

Dew forms only at positive temperatures - at negative temperatures, moisture from the air, immediately freezing, bypassing the liquid phase, goes into a solid state and frost is formed .