Hydrogen-Oxygen-Water: Fire Extinguisher?

[varsha]

hydrogen is a combustible substance and oxygen is a supporter of combustion. but water extinguishes fire. how is that?

 

[russ_watters]

Water is the waste product of the combustion you are describing. It has already been burned.

 

[DaveC426913]

Uh, yeah. That pretty much covers it.

Water is the "ash" left over from burning hydrogen.

 

[Gokul43201]

hydrogen is a combustible substance and oxygen is a supporter of combustion. but water extinguishes fire. how is that?

Varsha: Please look up the definition of a "compound" in your chemistry text.

To others: Something being a combustion product does not mean the thing is immune to further combustion (eg: CO, aldehydes), and that's besides the point here. Furthermore, water is most certainly nothing like an ash. An ash is the uncombusted residue; water is a combustion product.