Water's Liquid Phase: The State of Flow

Water moves and flows in its liquid phase. In this state, water molecules (H₂O) are close enough to maintain cohesion (hydrogen bonding) but have sufficient kinetic energy to slide past one another, giving the fluid its characteristic ability to flow, take the shape of its container, and maintain a nearly constant volume. The liquid phase exists between 0°C (freezing point) and 100°C (boiling point) at standard atmospheric pressure. Below 0°C, water solidifies into ice (rigid crystalline structure); above 100°C, it vaporizes into steam (molecules widely separated, chaotic motion). The liquid phase's unique properties—high specific heat, surface tension, solvent power—make it essential for life and geological processes.