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**Molecular formula:** H₂O **Molar mass:** 18.015 g/mol **Description:** Water is the most vital compound formed by the combination of hydrogen and oxygen. Under standard conditions, it is a colorless, odorless, and tasteless liquid. In larger quantities, it appears bluish. Water has a melting point of 0 °C and a boiling point of 100 °C, which are key reference points for the Celsius temperature scale. The molecules of water are connected by hydrogen bonds. **Use:** Water is an excellent solvent and a crucial reagent in numerous chemical reactions, including those occurring in living organisms. It is essential to all known forms of life on Earth. **Occurrence:** Water exists in three physical states: solid (ice and snow), liquid (water), and gas (water vapor).
