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After watching 'Myth Busters' and their experiments on exploding things, I feel more comfortable around my Propane appliances, fueling up and so on. The amount of Propane, or gas required to explode in free air would be great. You wouldn't be able to breathe easily if the fuel-to-air mixture was high enough to explode, or ignite.
I have worked on enough rooftop furnaces to see the difficulty a spark ignition has igniting a gas pilot. Everything has to be almost perfect.
In a freezer, a thaw takes a long time. When we travel our chest freezer easily survives even 4 to 6 hrs off power. The thermal mass of the frozen product keeps the cold. Now, the ice cream does get a little soft.
Water freezes at 32 Ice cream freezes at around 0 to 10 depending on the cream content.
I always ask the restaurant owner if the ice cream is hard when they call me on a problematic freezer. Tells me how bad the problem is, or if it is on defrost.(Temporary temperature rise.)
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