& Aeronautics and Astronautics Engineering http://web.mit.edu/aeroastro/www/ http://ocw.mit.edu/OcwWeb/Aeronautics-and-Astronautics/index.htm Abstract Water is a common chemical substance that is essential for the survival of all known forms of life . In typical usage, water refers only to its liquid form or state , but the substance also has a solid state, ice , and