[wajdi]

Please i want to know the temperature just over the flame of regular Bunsen Burner (unsing liquid cylinder gas or natural gas)

Thanx

[ATMyller]

It depends on used gas and how rich gas/air mixture is. Propane and natural gas with air baffle fully open can get up to 1800^oC.

[Donaldson Tan]

have you ever used a thermocouple or a platinum resistor thermometer in your entire life?

[jshine]

It's possible to calculate an adiabatic flame temperature with a specified mix of 'reagents' & specified flowrate.  Write down the reaction for the combustion:

2 H2 + O2 --> 2 H2O  for instance

Then find the change in enthalpy.  That's how much heat you're generating (actually, it will be heat/time since you deal with flow rates of fuel/oxidizer/inerts).  Since you know the temp that the reactants are when you start, you can look up heat capacities & calculate what temperature the products should be when they leave.  This will give a theoretical upper-bound on the flame temperature of a given mix of gasses.

/or just use a thermocouple  ;-)

[billnotgatez]

http://en.wikipedia.org/wiki/Bunsen_burner