Hak
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So, what's the problem with this? I don't understand. Could you explain some more? Thanks.hutchphd said:$$\rho(z,T)=\rho(z=0,T)e^{-\alpha z}$$and from the Ideal gas equation $$F_{lift}=\rho gV\frac{\Delta T} T$$the buoyancy is the mass of the air expelled because the ballon is heated. Also as mentioned N.B. $$\alpha\approx1/(20km)$$