Final answer:
Water has a high cohesion due to hydrogen bonding, which is a strong form of interaction between water molecules. It creates surface tension and allows water to stick together. The strong cohesion of water is responsible for its unique properties.
Step-by-step explanation:
Water has a high cohesion due to hydrogen bonding. Hydrogen bonding is a strong form of dipole-dipole interaction between water molecules. The partial positive charge on hydrogen attracts the partial negative charge on oxygen, creating an attraction that holds the molecules together. This cohesion gives rise to surface tension and allows water to stick together, forming droplets or creating a dome-like shape above the rim of a glass. The strong cohesion of water is also responsible for its high boiling point, solvent properties, and other unusual properties.