Evaporation is the process by which water changes from a liquid to a gas (water vapor).
It is a crucial component of the water cycle.
The sun's energy heats the water, providing the energy needed for the water molecules to escape into the atmosphere.
This process requires energy to break the bonds between water molecules.
Water evaporates from various sources, including oceans, lakes, rivers, soil, and even plants (through transpiration).
Transpiration is the process by which plants release water vapor into the atmosphere through tiny pores on their leaves called stomata.
The rate of evaporation is influenced by factors such as temperature, humidity, wind speed, and surface area.
Higher temperatures increase the rate of evaporation because water molecules have more kinetic energy.
Lower humidity increases the rate of evaporation because the air can hold more water vapor.
Higher wind speeds increase the rate of evaporation by carrying away water vapor from the surface.
Larger surface areas increase the rate of evaporation because there is more area for water molecules to escape.
Condensation
Condensation is the process by which water vapor in the air changes back into liquid water.
This typically occurs when the air is cooled to its dew point, the temperature at which the air becomes saturated with water vapor.
As the air cools, water vapor molecules lose energy and slow down, allowing them to come together and form liquid droplets.
Condensation releases heat into the surrounding air, which can sometimes lead to the formation of thunderstorms.
Condensation is responsible for the formation of clouds, fog, and dew.
Clouds are formed when water vapor condenses on tiny particles in the air, such as dust, pollen, or salt. These particles act as condensation nuclei.
Fog is a cloud that forms near the ground when the air near the surface cools to its dew point.
Dew is water that condenses on surfaces, such as grass and leaves, when the temperature drops overnight.
Precipitation
Precipitation is any form of water that falls from the atmosphere to the Earth's surface.
It includes rain, snow, sleet, and hail.
Precipitation occurs when water droplets or ice crystals in clouds become too heavy to stay suspended in the air.
This can happen when the air in the cloud becomes saturated with water vapor, or when the droplets or crystals collide and merge.
The type of precipitation depends on the temperature of the atmosphere.
Rain forms when the temperature is above freezing.
Snow forms when the temperature is below freezing throughout the atmosphere.
Sleet forms when rain falls through a layer of freezing air.
Hail forms when ice crystals are carried up and down in a thunderstorm cloud, accumulating layers of ice. Hailstones can range in size from small pebbles to larger than golf balls.
Collection
Collection is the process by which water gathers back into bodies of water, such as rivers, lakes, and oceans.
It represents the accumulation of water after precipitation.
Surface runoff is a major contributor to collection, where water flows over the land surface and into streams and rivers.