I don't think that's true. Depending on the air/gas mix at the point of the prop...

		drzaiusapelord on Dec 29, 2015 \| parent \| context \| favorite \| on: Why Engineers Can’t Stop Los Angeles' Enormous Met... I don't think that's true. Depending on the air/gas mix at the point of the proposed ignition it might require a very deliberate and difficult effort to light it.