Water is considered a good solvent because of its high dielectric constant. The dielectric constant is a measure of how well a substance can dissolve other substances. It indicates the ability of water to separate charged particles, such as ions, and facilitate the dissolution of solutes.

Option 1: Dielectric constant of water. The dielectric constant of water is high, making it easier for water to dissolve charged particles and solutes. This property is crucial for water to act as a good solvent, as it allows for the separation and dissolution of various substances.

Option 2: Surface tension of water. Surface tension refers to the cohesive forces between water molecules at the surface. While surface tension does play a role in some solvent properties of water, it is not directly related to its ability to dissolve solutes.

Option 3: Specific heat of water. The specific heat of water refers to its ability to absorb and retain heat. This property is important for regulating temperature, but it is not directly related to water`s solvent properties.

Option 4: Heat of fusion of water. The heat of fusion refers to the amount of heat required to convert a substance from a solid to a liquid state, or vice versa. While this property is significant for understanding water`s phase changes, it