The above, and more pictures from a camera that went up in a helium-filled balloon, snapping pictures once/minute, and be found on the SABLE-3 Balloon Launch page.
That's why you use a really stretchy balloon so that the helium in it expands as pressure decreases. I'm not a physics major, but I would /think/ that at that altitude, the helium would have close to the same pressure as the surrounding air. Assuming that the pressures are equal, helium still has an atomic weight of 2 versus 14 for nitrogen, so you have 1/7th the mass for the same volume. :-)
was this the same balloon that was 'supposed to be attached' to that crazy nut from BC Canada who was attempting to go for a super world record freefall and it 'left without him'?
(no subject)
Date: 2008-05-27 07:43 pm (UTC)(no subject)
Date: 2008-05-27 07:51 pm (UTC)(no subject)
Date: 2008-05-27 07:56 pm (UTC)That's why you use a really stretchy balloon so that the helium in it expands as pressure decreases. I'm not a physics major, but I would /think/ that at that altitude, the helium would have close to the same pressure as the surrounding air. Assuming that the pressures are equal, helium still has an atomic weight of 2 versus 14 for nitrogen, so you have 1/7th the mass for the same volume. :-)
(no subject)
Date: 2008-05-27 08:25 pm (UTC)(no subject)
Date: 2008-05-27 10:23 pm (UTC)SCIIIEEEENNNCCEEE!!
(no subject)
Date: 2008-05-28 12:52 am (UTC)Yeah, wow that's beautiful! :)
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Date: 2008-05-28 11:04 am (UTC)