Here's why:
* H₂O(l) represents liquid water.
* H₂O(g) represents water vapor (gaseous water).
* Heat is added to the system, providing the energy needed to break the bonds between water molecules in the liquid state, allowing them to transition into the gaseous state.
Therefore, the equation represents the change of state from liquid water to water vapor, which is the definition of evaporation or boiling.
