Posted by **Caitlin** on Tuesday, November 20, 2012 at 6:57pm.

A meteorological balloon had a radius of 1.1 m when released at sea level at 20◦C. It ex- panded to a radius of 5 m when it had risen to its maximum altitude, where the temperature was −20◦C. What was the pressure inside the balloon at that altitude? The volume of a

sphere is V = 4 π r3 . 3

Answer in units of atm

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