Shahed

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 * __Shahed Mahmud's Personal Wiki-Space [[image:http://www.mt-pleasant.org/depts/fire/training/hose1.jpg width="377" height="297" align="left"]][[image:http://www.wtfd.us/events/dept_events/training/fog_stream_method2.jpg width="383" height="297" align="left"]] __**======



 Why do firefighters use a mist of water instead of a heavy stream?
 ====Firefighters use a mist of water because the individual water molecules need to be spread out to absorb the heat of the flame. As the water is heated, it evaporates because the __molar heat vaporization__ of water is 40.6 kJ/mole. Water is polar and it’s attraction to hydrogen is known as __hydrogen bonding__. The oxygen of water has higher __electronegativity__ then hydrogen, and therefore oxygen and hydrogen form a __dipole.__ In addition, if a firefighter uses a heavy stream of water, there is a chance the water will just push the fire aside instead of putting it out. ====

**Sources:**
Farndon, John. "Water." 56. Mason Crest Publishers, 2003. MAS Ultra - School Edition. EBSCO. PFTSTA, Jefferson, LA. 16 Nov. 2008 .

Leigh, G. J. et al. 1998. Principles of chemical nomenclature: a guide to IUPAC recommendations, p. 99. Blackwell Science Ltd, UK. ISBN 0-86542-685-6


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