LET'S BLOW
'(<a href="http://www.j-archive.com/media/2010-07-13_J_25.wmv">Sarah of the Clue Crew tries to blow out a candle from a distance, first with her mouth, then a plastic soda bottle.</a>)  Blowing out a candle from far away is hard because the blown air disperses, but concentrate the air through a small opening & it creates a whirling mass of air like a tornado called this'
a vortex