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The air inside a hot air balloon has an average temperature of 71.7° C. The outside air has a temperature of 11.1° C. What is the ratio of the density of air in the balloon to the density of air in the surrounding atmosphere?

  • physics -

    Since the pressure is very nearly the same inside and outside the balloon, density is inversely proportional to absolute temperature.

    rho_inside/rho_outside = T_outside/T_inside
    = 284.3/344.9 = 0.824

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