There are a number of processes that are crucial for the formation of various weather conditions. Specifically, evaporation and condensation play a critical role in creating different meteorological events and phenomena.

One can almost go as far as stating that very few weather events, if any, will be able to take place without at least one or both of these processes playing a significant part.

This will soon become clear when one sees these two processes at work, creating different weather conditions.

In this article, we examine exactly what evaporation and condensation are, their differences, and their impact on the weather.

Before delving into the details of what evaporation and condensation are, as well as their impact on the weather, a concise summary of the difference between the two processes will help to set the stage:

The Difference Between Evaporation And Condensation​​​​​​​​​

Evaporation is the process through which water is changed from its liquid state into its gaseous state. Condensation, on the other hand, occurs when water is changed from its gaseous state back into its liquid form.

This short summary will help to provide some clarity as to what these processes are and their fundamental differences. We can now turn our attention to each process in more detail.

Probably without even realizing it, the vast majority of readers have already seen examples of both evaporation and condensation at work.

If you have ever seen a puddle slowly disappearing after rain or wet clothing drying in the sun, you have experienced evaporation.

Similarly, if you ever noticed the dew on the grass when leaving your house in the morning or saw the dewdrops on your car, which stood outside throughout the night, you have seen the results of condensation.

Essentially, evaporation and condensation are two sides of the same coin. They both involve a substance in its liquid or gaseous form, changing from one to the other.

Evaporation can be defined as follows:

“Evaporation is the process through which a substance is changed from its liquid state into a gaseous state, mainly due to a rise in temperature but also as a result of a decrease in atmospheric pressure.”

Evaporation typically occurs at the surface of a body of water when rising temperatures cause it to turn into water vapor.

Condensation can be defined as follows:

“Condensation is the process through which a substance changes from its gaseous state back into a liquid state, mainly due to a drop in temperature or when the saturation level of the air exceeds the amount of moisture it can carry.”

However, when a substance changes directly from its solid form into a gas, it is known as sublimation, and when it turns from its gaseous form directly into a solid state, it is known as deposition.

When water vapor (water in its gaseous state) is cooled below its dew point, or the air becomes saturated and can no longer hold any more moisture, condensation takes place. In the atmosphere, this typically leads to the formation of clouds.

Now that we have established what each process entails, we can examine the effect they have on the weather and related events.

As mentioned in the introduction, evaporation and condensation play a vital role in the formation of weather, and without them, many weather events would be virtually impossible.

Earlier, it was also mentioned that they are two sides of the same coin, which was already partly explained in the previous section when both processes were defined in more detail.

Although they each have their own roles to play, together they form part of an overarching process called the water cycle.

The Water Cycle (Hydrologic Cycle) can best be described as Earth’s Big Recycling System. It is the process through which water is moved between the land, ocean, and atmosphere.

One can view it as nature’s fine balancing act, continuously moving water between the land, oceans, and atmosphere. Although local areas can still become very dry or oversaturated, the cycle helps redistribute water across the planet and keeps the overall amount of water in the system largely constant.

The water cycle can best be described by breaking it down into its four steps:

1) Evaporation and Transpiration

Ocean water, as well as water in inland rivers and lakes, is heated by the sun, causing water at the surface to evaporate. The leaves of plants and trees also release moisture into the air through a process called transpiration. Both processes cause water vapor to rise into the atmosphere.

2) Condensation

As the water vapor continues to rise, the surrounding air starts to cool. Once it reaches its dew point, condensation takes place and clouds begin to form. Air movement in the atmosphere can carry the water vapor away, causing clouds to form above or at a completely different location from where the water originally evaporated.

3) Precipitation

As more water vapor condenses, water droplets or ice crystals form and continue to grow inside the clouds. Once they become too heavy to remain suspended in the air, precipitation takes place. (This can be in the form of rain, snow, hail, or even sleet.)

4) Runoff and Groundwater Absorption

The rain falls on surfaces of various heights. The force of gravity makes sure the water finds its way into natural runoff areas like streams and rivers, which eventually flow back into the ocean or other bodies of water. Some of the water also gets absorbed by the soil through a process called infiltration, which helps to replenish and maintain groundwater tables.

As you can clearly see, evaporation and condensation play a critical part in the water cycle. Each one also has a unique effect on its environment and certain weather events, which we will have a look at in the next section.

Learn more about the water cycle in this in-depth article.

Apart from its impact on the water cycle, evaporation also has a few other specific attributes and weather conditions associated with it.

Evaporation is often called a Cooling Process. You won’t be blamed for being more than a little confused after reading this contradictory statement. After all, it is the heat of the sun that warms up the surface water and causes it to evaporate.

It takes energy, in the form of heat, for water to evaporate from the surface of a body of water. As the highest-energy water molecules escape into the atmosphere, they carry heat away from the surface, causing the remaining water and surrounding air to cool down. Hence the Cooling Process.

Large-scale evaporation over warm tropical and subtropical oceans provides the moisture and heat energy that help fuel some of the most devastating weather events on Earth. When other favourable atmospheric conditions are present, a developing tropical storm can intensify into a hurricane or tropical cyclone.

It is clear what will happen when a hurricane or cyclone makes landfall. To find out more about hurricanes and cyclones, as well as their devastating effects, you can read the in-depth article here.

Like evaporation, you now have a good idea of what condensation is and the role it plays in the water cycle. It also has a few other specific attributes and weather conditions associated with it.

In contrast to evaporation, condensation is referred to as a Heating Process. This can be confusing and seen as a contradiction as well, since condensation is the result of a drop in temperature and colder conditions in general.

For water vapor to return to its liquid form, it has to lose some of its heat energy. Once enough energy has been released, water vapor turns into water droplets. In the process, heat is released into the atmosphere, causing it to heat up. Hence the Heating Process.

When condensation takes place within a moisture-rich cloud system that is continually supplied with fresh moisture, the result can be heavy and persistent rainfall. This commonly occurs during the summer monsoon season in India and Southeast Asia.

Moist monsoon winds continuously drive moisture-filled clouds into the subcontinent during the summer months. The resulting condensation leads to frequent and heavy downpours, which can cause flash flooding throughout the warm season, resulting in fatalities and large-scale damage.

You can read more about monsoons, how they are formed, and their effect on the environment in this article. (Look towards the end of the article under the “monsoons” section.)

Condensation also results in a variety of cloud formations, which are visible indicators of the kind of weather to expect. You can read all about the different cloud formations and what each one means in this article.

If it was unclear to you before, you should now have a good understanding of what exactly evaporation and condensation are, and how each process takes place.

Even more importantly, you will realize just how critical both these processes are in the formation of many weather events.

Until next time, keep your eye on the weather!