On Mon, 28 Mar 2005 21:04:16 -0800, "Rich S."
wrote:

Couple of personal anecdotes, here.

I've got one too. I remember an assembly in High School in which some
fuel/fire expert came to speak to us. He had a rig that looked a lot
like a ski jump. It was about two feet worth of ramp and had a ball
of cotton tied to the top, and a candle lit at the base.

He lit the candle and then doused the cotton ball with just a few
drops of gasoline he carried in a sealed beaker. Then he walked
around talking about how the fumes were heavier than air while we all
stared at this contraption.

About two minutes later while this guy was still talking, the candle
suddenly lit up brighter and a little puff of flame began to climb up
the ramp. It moved up the ramp and the cotton ball burst into flame.

I never forgot that, what a great demonstration of how the fumes
descend into low spots.

Corky Scott