Question: A weather balloon is designed to expand to a maximum radius of 2 3 m at its working altitude, where the air pressure is 0

A weather balloon is designed to expand to a maximum radius of 23 m at its working altitude, where the air pressure is 0.030 atm and the temperature is 200 K. If the balloon is filled at atmospheric pressure and 288 K, what is its radius at liftoff?
 
 

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