In article ,
Ed Sirett writes:
On Thu, 11 Oct 2007 21:21:48 +0000, geoff wrote:
Gas is explosive in a concentration of between 5 and 15 percent

I suspect that this was a lot of gas, given the huge fireball that came
after the blast I suspect that the concentration may have been towards the
UEL.

It could be that there was one room within the explosive
range, and another room at a higher concentration, which
was released by the explosion to form a fireball. A
visible fireball probably requires an excess of gas and
deficiency of oxygen in the mixture in order to create
the classic fireball colour.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]