CH4 LEL question, why does LEL differ from location to location?
In the UK (and EU) it's 4.4%/vol for CH4, UEL is 17%/vol.
In the US, the LEL is 5% and UEL is 15%.
Why are these so drastically different? obviously, methane and oxygen don't change if you cross the Atlantic and physics is just physics, universal.
So surely, unless I'm missing something, one of these must be incorrect?