What is the volume ratio of a helium balloon at different altitudes?

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SUMMARY

The volume ratio of a helium balloon at an altitude of 3330 m compared to sea level is calculated using the Ideal Gas Law, represented by the equation PV/T = PV/T. At sea level (20.0°C, 1 atm), the balloon's volume is compared to its volume at 3330 m (5.0°C, 0.65 atm). The final calculated volume ratio is 0.94, indicating a decrease in volume due to lower pressure and temperature at higher altitudes. The tension in the rubber also contributes to the internal pressure of the balloon.

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  • Familiarity with the concept of volume ratios
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A child's helium-filled balloon escapes at sea level and 20.0°C. It reaches an altitude of 3330 m, where the temperature is 5.0°C and the pressure only 0.65 atm. What is the ratio of its volume at this altitude to its volume at sea level?

PV/T=PV/T


i got .94
 
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Did you take into account the drop in air pressure?
What will this do to the volume of the balloon
 


Also, don't forget that the pressure inside the balloon gets a contribution from the tension in the rubber.
 

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