In a dryer, the clothes are mechanically dried up squeezing the clothes to separate from water forcefully, while in hanging, the clothes dry up in a natural way. All the water that drips from the clothes goes to the air, that’s it.
Now just think where all the water goes from billions of clothes dried up daily in the world by hanging them outside under the heat of the sun. Under broad daylight and even if small amount of rays is coming from the sun, all the water become part of the air and go to the atmosphere in a process called evaporation.
When the water goes to the air, it is hidden by the clouds in the sky and the clouds become white, some are gray and others become dark. The clouds are white because they are not yet ripe to fall as rain. Some are gray because they have already formed some droplets of water that are ready to come back to the earth. Others are dark because anytime, they will fall as heavy rains.
These rains form part of the rivers, oceans, lakes and other waterways. Water fall as snow during winter so, it becomes a cycle from the earth and goes back to the earth. The air is saturated in the clouds that it’s hard for it to hold water because of the low temperature. Hence, the droplets of water in the clouds start growing combining with the extra water in the moist air of the clouds.
When these water droplets become so large by constantly hitting each other during a thunderstorm, they are pulled by the gravity of the earth. Still, when they become larger by combining with other droplets, they fall out on the earth as rain.
Supposing a big container filled with water is placed in an open space but the temperature does not change, would the process of evaporation be slower? Humidity depends on the temperature and the air’s vapor pressure controls the process. Proportionality is not regarded as a linear inverse; the density of the air affects the rate of evaporation. This process is decreased slightly when more water vapor goes to the air which also lowers the air temperature.
Therefore, it is safe to assume that the water in a big container placed under constant temperature would evaporate slower than if the temperature is rising or variable. There are several factors that affect evaporation but in reality, only a few major factors will work together to effect the process of evaporation. For example in a field of crops, the soil moisture in the soil will not evaporate quickly even if it is under the heat of the sun if there are large plant canopies that obstruct the process of evaporation.
The process of evaporation is clearly described in equations involving chemical kinetics. It is a competition between the evaporation process whereby water molecules present in the water moves to the liquid phase or what we call the process of condensation. At any kind of temperature, evaporation is proportional to water concentration in the liquid phase if there is an amount of water involved. However, this condition is altered when there is something that is dissolved in water like salt.