OK
Uncle, uncle.
I learned something,
from here. I also read a lot of other words at the same site that didn't produce any actual learning, so, no damage done.
Still. ... a flammable mixture when air is introduced at ratios between 4 and 75%. That seems like a wiiiiiidde band of DO NOT GO THERE. Anyhow, all very interesting. And I'm glad you didn't get shot xoB.