1. Physical Properties: These are characteristics that can be observed or measured without changing the substance's chemical composition. For water, some key physical properties include:

* State of matter: Water exists as a solid (ice), liquid (water), and gas (water vapor).

* Density: Water is denser than air but less dense than most solids.

* Boiling point: Water boils at 100°C (212°F) at standard pressure.

* Freezing point: Water freezes at 0°C (32°F) at standard pressure.

* Surface tension: Water has a relatively high surface tension, allowing insects to walk on its surface.

2. Chemical Properties: These describe how a substance reacts with other substances. For water, some key chemical properties include:

* Universal solvent: Water is known as the "universal solvent" because it can dissolve many substances. This is due to its polar nature, allowing it to attract and surround other molecules.

* Reactivity: Water can react with certain substances, forming acids and bases.

* pH: Pure water has a neutral pH of 7.

3. Biological Properties: These relate to water's role in living organisms.

* Essential for life: Water is vital for all known life forms. It makes up a large percentage of cells and is involved in many biological processes.

* Solvent for biological molecules: Water dissolves many important biological molecules, allowing them to move and interact within organisms.

* Temperature regulation: Water helps regulate body temperature in animals, as it absorbs heat without drastically changing its own temperature.

These are just a few examples, and there are many other properties of water! Let me know if you want to explore any of these properties in more detail.