water (H2O) in the gaseous phase, the highest energy state (compare liquid water and ice). Each gram of water vapor contains 680 calories of latent heat, 80 stored in the liquid during melting from ice, and another 600 during the evaporation from liquid to water vapor. This energy is released back into the atmosphere, 600 calories per gram during condensation, and another 80 during freezing. If the water vapor skips the condensation phase and goes directly to ice (see deposition), all 680 calories per gram are liberated at once! This heat release contributes significantly to the energy of storm systems. Water vapor is the highest energy state for water; compare ice and liquid water.