Filter/dilution tunnel. A smoke sample is drawn via a tube where it truly is diluted with air, the ensuing smoke/air combination is then pulled through a filter and weighed. This is the internationally acknowledged method of measuring smoke from combustion.[66] )[18] Magnetic remanence, recorded from the iron oxide particles, https://arthurocobn.wikilinksnews.com/5997548/the_5_second_trick_for_smoking