"Tim Wescott" wrote: (clip) That may be the one (partially) true claim,
actually.

Hydrogen remains largely transparent as it burns, so it emits very little
light. (clip)
^^^^^^^^^^^^^^^
Tim, only if you DEFINE temperature in terms of radiant emission can you
cling to that statement. Are you aware of the deaths that have occurred at
the Indy Speedway because alcohol flames are not visible in daylight? If a
torch truly produced a low temperature flame, it wouldn't be worth s**t for
welding. It isn't necessary to heat some other surface in order to have
heat. One of the laws of thermodynamics is that heat ALWAYS flows from a
higher temperature to a lower temperature. If the flame were really cool,
it COULD NOT HEAT ANYTHING TO A HIGHER TEMPERATURE.