1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: Helium and Balloons/Pressure

  1. Dec 2, 2007 #1


    User Avatar

    [SOLVED] Helium and Balloons/Pressure

    1. The problem statement, all variables and given/known data

    A tank having a volume of 0.100 m3 contains helium gas at 120 atm. How many balloons can the tank blow up if each filled balloon is a sphere 0.300 m in diameter at an absolute pressure of 1.35 atm?

    What i know:
    P(tank)=120atm=1.21E7 Pa

    P(balloon)=1.35atm=1.36E5 Pa

    Volume(helium)=1.23E-26 m^3


    So, once the helium is transfered into a balloon the volume it takes up changes due to the change in pressure, correct? I'm not sure how to relate all these quantities in order to find out how many balloons I can fill the the with the given volume of He.

    Any suggestions?

  2. jcsd
  3. Dec 2, 2007 #2


    User Avatar
    Science Advisor
    Homework Helper

    What's the volume of 0.1m^3 of helium at 120 atm if you reduce it to 1atm. Then how many balloons can you fill?
  4. Dec 2, 2007 #3


    User Avatar

    1.21E7Pa (.1m^3)=1.36E5Pa (V)=629 ballooons

    thank you
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook