I'm unable to see the illustration you are referring to. However, if you describe the phase change depicted—such as melting, freezing, condensation, or evaporation—I can help explain the process involved.
This phase change is called evaporation.
change in temperature
A phase change occurs when a material goes from a gaseous state to a liquid state, a liquid state to a solid state, or the above in reverse order.
The heat added to a saturated vapor to raise its temperature above its boiling point is referred to as sensible heat. This is because the heat causes a change in temperature without a phase change.
This is properly called "freezing". Occasionally, it can be called "solidifying", but that's not really correct.
The phase change that causes clouds to form is condensation. When water vapor in the air cools and condenses on tiny particles like dust or ice crystals, it forms cloud droplets. These droplets then come together to create clouds.
During a phase change, energy is being absorbed or released to break or form intermolecular forces rather than increasing or decreasing the temperature. This energy, known as latent heat, causes the temperature to remain constant until the phase change is complete.
Vaporization (evaporation) of water to a gas is caused by heating the water.
The added energy is used in the phase change to break intermolecular bonds.It is used for the phase change. ~ APEX
An energy transfer does not always result in a phase change because the energy can be used to increase the temperature of a substance without causing it to change from one phase to another. Phase changes occur when a substance reaches a specific temperature and energy level that causes its molecular structure to rearrange, such as melting or boiling.
the water cycle-it changes forms for various reasons, when the sun heats water, it turns to water vapor which is a gas, and rises to the sky where it cools down into liquid particles, light enough to stay floated in the air, until its released as rain to the ground. with snow it can either be melted and then evaporated, or the sun can cause snow to evaporate snow without even turning to liquid. and transpiration is when the water on trees and other plants is evaporated. (but all of these start with the SUN. so you can say the cause of phase changes always starts with the sun)