Quote Originally Posted by fingz999 View Post
its still pressurised so can still go bang (a empty nos bottle that is)
It will go pop, but technically only a pressure 'explosion' (essentially a very fast evacuation of air) will take place, there will be little or no exothermic reaction, only if, there is "ANY" gas left in there will you get a B.L.E.V.E. which starts as an endothermic reaction and violently become an exothermic reaction.

Anyone who's ever chucked a can of lynx on a bonfire will know