A balloon having a capacity of 10000m^3 is filled with helium at 20 degree Celsius and 1 atm pressure.if the balloon is loaded with 80% of mass that it can lift at ground level,at what height will the balloon come to rest?Assume that balloon`s volume is constant,the atmosphere geothermal,20 degree Celsius,the molecular weight of air is 28.8,and the ground level pressure is 1 atm.The mass of the balloon is 1.3(10*6).plzz tell me.

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