Liquid water is a clear, colorless, and tasteless substance that is essential for all known forms of life. It is made up of two hydrogen atoms and one oxygen atom, giving it the chemical formula H2O. Liquid water exists in various environments, from oceans and rivers to lakes and glaciers, and it plays a crucial role in weather patterns and climate. At temperatures between 0°C and 100°C at sea level, water remains in its liquid state. It has unique properties, such as high surface tension and the ability to dissolve many substances, making it an excellent solvent. These characteristics are vital for biological processes and ecosystems, supporting life on Earth.