Any time natural gas fills an area , in the presence of oxygen (at a concetration typical in air), you have a risk of a gas flare up.
Any hissing sound near a gas line is an indication. Also, while natural gas itself is odorless, during processing, an garlic-like or rotten-egg scent is added to the gas especially so you can detect it. If you smell this scent, that's evidence of a gas leak.
You can also test to see if a gas line is leaking by gently mixing dish washing liquid into water, so there are very few bubbles, then "painting" this on the part of the gas line you want to test. If bubbles form, that too is evidence of a gas leak.
If you even think you may have a gas leak, here's what to do:
Most gas leaks do not result in explosion, as it takes a lot of gas accumulating in one place to generate that much energy. However, better safe than sorry.
A more common risk apart from a gas leak is if an appliance is left on unlit. If this has happened you should switch of the appliance, open windows and avoid doing anything which might create a spark, see point 2 above, until the gas has dissipated.
Dry dust in the air can explode. Removing the dust prevents the possibility of an explosion.
To rid the engine compartment of gas fumes, thus reducing the possibility of explosion.
Cleveland East Ohio Gas explosion happened in 1944.
The Wickwar gas explosion itself was was in the early hours of Friday 9th January
Esso Longford gas explosion happened on 1998-09-25.
An explosion involve generally chemical reactions.
Indirectly, yes Tornadoes have been known to break gas pipes.The leaking gas can then create an explosion if exposed to spark or flame.
"Explosion."
NO
You get an explosion.
Exothermic
It's very flammable - a spark can cause an gas explosion.