Why Does Dew Form?

One of the most poetic things anyone can probably imagine is DEW. It revives the childhood and old memories.

The name ‘dew’ has a charming effect, it can be found on cool surfaces in morning or on leaves, grass, tree or window panes.

What is dew made of?

Dew is basically made up of water but it is the water that has condensed from water vapor in the air. When the air above the ground cools down then fog is formed. But it’s only the surface that cools down for dew to form while a thin layer of air drops water vapors to trees, leaves, grass and other surfaces.

dewdrops Why Does Dew Form?

Dew is formed when vapor reduces to liquid in the earth’s atmosphere. This process usually starts in the night and continues well till early morning. The point at which the vapor gives way to dew is called a dew point. Strange enough, dew is formed faster on car windows rather than on the grass.

The Earth’s surface warms the atmosphere during the day time. The atmosphere absorbs moisture in return and during the night, the earth cools along with all living things on top of it.  Some type of things release heat during daytime reaching a significant temperature quickly. Although others materials like cement, brick, etc holds heat well and so they stay warmer than their surroundings for a longer time. As the ground starts to cool, it also cools the air above it. The air then gets saturated which means that it cannot hold its current load of the vapor further condensing that moisture into cooler objects. Those objects that tend to hold heat like bricks and concrete rarely collect dew because by that time they are cool enough to collect dew, the moisture has already condensed mostly.

This goes on even on cloudy nights. The clouds push back the heat of the ground forming dew except for the places that are high where the heat buzzes out. Dew is different in that case from rain. Dew is formed on the ground and not in the clouds. On colder nights, dew gets denser and can even turn into frost.

Analogy of dew formation

There is also another way of looking at the dew formation by looking at a cold can of a cold drink. As we know that the can contains cold soda inside and there is a warm temperature outside. When the two meet together, the air which is caught up in the middle gets cooled down resulting in water molecules in the air binding with one another. After condensation, they form water droplets on any nearby surface.

Dew’s role in nature

Even in the driest places of the world like the Sub Saharan region, the dew formation can be observed every time. In those places which have no virtual rain fall throughout the year, dew serves its place. It is strange but dew can be dense in than rainfall in those places. This is the reason that desert plants and animals flourish on dew from day to night. Dew can also form in extremely hot places when the surface temperature of the soil drops below the so-called dew point. If that does not happen then there is the attendant water vapor absorption as a backup.

The effect of the dew is so cool that popular drinks have been inspired to name it. It is just the mere thought as it cools one down.

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