Why is LPG gas dangerous?

Answer 1

I'm going to assume you mean Liquid Propane Gas (or LPG in the US) even though this question first started with PLG -- a very rare acronym here. First, LPG liquidizes because it's under pressure. Releasing that pressure with any degree of suddenness with superchill whatever it comes into contact with (see Boyle's Law), so freezing injuries can occur. Secondly propane gas is highly flamable, so there's a serious fire hazard. Sudden ignition in an inclosed space can result in an explosion as well. Thirdly, in a confined space, propane, which has a higher specific gravity than oxugen, can displace oxygen in a confined space, thus creating a hypoxia hazard. Fourth, any compressed gas presents a kinetic hazard in that the pressure differential between ambient and compressed gas can cause kinetic trauma.