a simple physics puzzle

Hi,
Here is a simple puzzle.

Weight of the flying bees

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We have bees flying in a jar, not touching it. Jar is closed and air in it has standard atmospheric pressure. Here is the question: if we put that jar on a weighing-machine, is it going to show the mass of the bees? Why?

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Regards,
Karthik Iyer

http://wwww.physicsforums.com/showthread.php?t=170218