Actually, you don't get much.

You all are very off.
Light the two gasses on fire, like you would in real life. When the fire clears you should have smoke and water vapor.

@theopfor (View Post)
That is correct. That is near exactly what happens in real life.
The reaction works because the fire is supplying start-up energy to form the bonds between the atoms. From there the reaction releases energy, causing a release of fire and (in real life) sound. That's why electrolysis, the reverse of this reaction, requires you to supply energy.

you have tu burn it. Then there should be watr what turns steam

In fact you should burn them out
But in TPT, just raise the pressure

@theopfor (View Post)

 your supposed to burn it! Because it makes water vapor!

You have to combine HYGN and OXYG. U need to pressure it a little bit (Pressure: ca. +50) and heat it (Temp: ca. +200) and burn it. You get WTRV. Cool it and you have WATR.

 

Congratulations, you created water.