When water is boiled, its internal energy increases as it transitions from cold to hot, directly correlating with the rise in temperature. This increase in internal energy is associated with the kinetic energy of water molecules, which move more rapidly at higher temperatures. As the temperature rises, the properties of water change, affecting its molecular bonds and interactions. The boiling process continues until the maximum temperature is reached, at which point the water transitions to steam. Understanding these changes is crucial for grasping the thermodynamic principles involved in boiling water.