1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Balloon Design

  1. Sep 23, 2005 #1
    For a lab I am working on, we are designing a high-altitude research balloon.

    I have some questions though.

    1. How do I calculate the volume of a zero-pressure balloon? By taking my mass of the body over the density of the air at altitude, does this give me the volume of gas needed at that altitude? But the zero-pressure has a larger envelope that isn't filled so that the gas expands.

    2. From question 1, how would I figure out how much lifting gas i needed at the ground? Is there a formula I can use?

    3. How do I compensate for the diurnal cycle to maintain a specific altitude?

    Thanks for the help!
  2. jcsd
  3. Sep 23, 2005 #2


    User Avatar
    Homework Helper

    surely you mean "zero gauge pressure" ...
    This is P_atm = 10^5 N/m^2 at ground!
    Bouyant Force is (rho_displaced)(V_displaced)g
    As P decreases, V of the gas increases
    . . . but not for your payload!
    Unless you heat it, lifting effectiveness
    will decrease consistently as it rises.

    I have only half-baked ideas for T stability!
    Good Luck!
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Balloon Design
  1. Meteorological balloon (Replies: 52)

  2. Balloon problem (Replies: 3)

  3. Weight of the balloon (Replies: 8)

  4. Balloon in Truck. (Replies: 14)

  5. Balloon Pressure (Replies: 18)