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I'm making a tea bag experiment (Make a hollow cylindrical tube from light paper e.g. from an empty tea bag. When the top end of the cylinder is lit, it takes off.) I need to know how hot air is moving so please help me if you have thermal imaging camera or with out it write your opinion

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closed as not constructive by Waffle's Crazy Peanut, Manishearth Dec 23 '12 at 18:14

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I know the main idea but I would like to know the character of air movement . Thank you in advance. –  baletiano Dec 23 '12 at 12:00
The character of the air movement is turbulent. It has a Reynolds number, which can give you a rough characterization of the behavior, based on the width of the tube, the density of the air (a function of it's temperature and pressure) and the viscosity (also a function of temperature and pressure). The concise answer is: It's complicated. Real complicated. –  KDN Dec 23 '12 at 12:54
Removed the -1 by adding a +1. Can you please stop the ridiculous drive by negative voting??? –  Antillar Maximus Dec 23 '12 at 15:31
how can I calculate pressure? –  baletiano Dec 23 '12 at 16:17