Water, chemically known as H₂O, is a transparent, tasteless, and odorless liquid essential for life. It is the main constituent of Earth's hydrosphere and the fluids of all known living organisms, acting as a solvent. Water exists in three states: solid (ice), liquid (water), and gas (water vapor). 
 
Key Properties and Significance:
    • Chemical Formula: H₂O. 
       
    • States: Solid (ice), liquid (water), and gas (water vapor). 
       
  • Universal Solvent: Water can dissolve more substances than any other liquid, making it crucial for biological processes and the transport of nutrients and minerals. 
     
  • Density: Water has a density of 997 kg/m³.
     
  • Freezing Point: 0°C (32°F). 
     
  • Boiling Point: 100°C (212°F). 
     
  • Importance to Life: Water is essential for all known living organisms, playing a vital role in biochemical reactions, cell structure, and temperature regulation. 
     
  • Human Body: Water accounts for a significant portion of the human body's weight (around 60%) and is crucial for various bodily functions, including nutrient transport, waste removal, and joint lubrication. 
     
  • Environmental Significance: Water covers approximately 70% of the Earth's surface and plays a crucial role in the water cycle, influencing weather and climate patterns.