Tanks and naval ships may use the injection of fuel or special "fog oil" into exhaust tract to create smoke screens. Rather than burning, the oil normally evaporates and re-condenses at a particular droplet size, but under abnormal conditions it may catch fire or even produce a fuel-air explosion.
Cars extensively modified for visual appearance and not road use (stunts, ads, movies etc.) may be fitted with gasoline injectors in their exhaust systems, or even with small flamethrowers separate from the exhaust.
Read more about this topic: Back-fire
Other articles related to "purposely":
... These terms are (in descending order) "purposely", "knowingly," "recklessly", and "negligently", with a fifth state of "strict liability" ... Purposely ... is illegal to knowingly do X," then it is illegal to do X knowingly or purposely (a more severe state), but not to do so recklessly or negligently (the two less severe states) ...
... jammed the signal on communications coming into the helicopter, and purposely searched for the key to unlock Patrick in places he knew it wouldn't be ... Golf Alan purposely got his question wrong ... Dam Flags Alan was the only player who had previously abseiled, but he purposely missed the harder flag and went to the easier one, since he (correctly) thought it was ...
... is canoeing, but in this assignment, he purposely used a poor rowing stroke that slowed the waka down and kept them from winning the $10,000 ... Canyon Swing John purposely missed an easy question when Heidi was attached to the canyon swing ... himself to get caught by the hunter, but purposely took a turn divergent from Craig's directions, taking a second beacon that was put out of play ...
... Winifred was purposely sunk in 1936 to form a breakwater off Luamba Island ... In 1967 Sybil was purposely sunk at Kisumu to form a breakwater ... In 1936 she was purposely sunk at Bukakata to form a breakwater ...
Famous quotes containing the word purposely:
“So much they scorn the crowd, that if the throng
By chance go right, they purposely go wrong.”
—Alexander Pope (16881744)
“I cannot see how a man of any large degree of humorous perception can ever be religiousexcept he purposely shut the eyes of his mind & keep them shut by force.”
—Mark Twain [Samuel Langhorne Clemens] (18351910)