bruto
Penultimate Amazing
How about getting into the tub and pulling a mattress over the top? 
Let us suppose that the propane line that is busted open is in the kitchen and there is an already existing fire in the nearby living room. Now you can go to the back of the house where my previous scenario is setup but you can't leave the house because of armed gunman surrounding it. So the explosion, when it happens, will occur when the cloud of propane gas reaches the flames in the living room.
Given that, which would be better?
I vote for water.
Speed of sound is higher in water than in air. The FAE will likely not be pure detonation anyway. You'll be dealing with a relatively gentle pressure rise, but even if there is one it will not couple efficiently to the water. Inside the tub you'll experience essentially a hydrostatic pressure increase, not a blast wave.
The primary danger will be fire, getting hit by debris as the house collapses, and getting hit by primary shrapnel, in that order. The water helps with all three. Mattresses probably help the last but do little about the other two.
Besides, my bathtub is cast iron. It can probably support the roof of my house.
That's my vote off the top of my head, anyway. Never tried it.
ETA: Happy birthday!
How about getting into the tub and pulling a mattress over the top?![]()
If the gas/air mixture is really all over the house, it will also be in your lungs, do hold your breath to keep it from propagating into your lungs, as this has unpleasant side-effects.
I was talking about the side effects if the propane in your lungs take part in the explosionHe said it was propane, right?
It's not that unplesant, and also - legal
Some hallucinations aren't out of the question, and you could feel dizzy and so on, but this shouldn't be that much of a problem, unless you're giving a public speech shortly after - where your wet clothes will be more of a problem anyway.
McHrozni
.I was talking about the side effects if the propane in your lungs take part in the explosion.