Read about balloon | 18 Discussions | Page 1

  1. H

    Air flow in a balloon

    I have a problem. The task is to develop an differential equasion of the airflow of a balloon. I know that it is dependent on the volume and pressure. But I can't get a good differential equasion. Can someone help me? [Thread moved from the technical forums, so no Homework Help Template is shown]
  2. K

    I Pressure Difference Between the Inside and Outside of a Balloon

    Hello all. I have a question about gasses and pressure: Is there a way to calculate how strong a material making up a balloon has to be to withstand a given pressure difference between the inside and outside? In other words, if I have a balloon I need to fill to a pressure of 10atm inside vs...
  3. Pat Trainor

    Need a material that can hold Helium...

    Experts, I'm in need of a balloon to hold an RF antenna aloft, and that can have a light (LED) in it. For cost & safety, it appears Helium is the choice. But everything I'm reading says that He atoms are so tiny they pass (eventually) through traditional balloon materials quickly. There is a...
  4. prashantakerkar

    B Measuring the weight of gas in an inflated balloon

    What could be the method for measuring weight of gas in inflated balloon? Thanks & Regards, Prashant S Akerkar
  5. V

    How to produce a harmless gas in seconds? (for an emergency car floatation device)

    I need to make the design of car floatation devices. In my case, the airbag/raft is for floating the car in case of floods. I am considering to use Sodium Azide, just like in car airbags, but it inflates very fast and shrinks in a short time. Is there any other chemical reaction that can produce...
  6. R

    Materials for space applications?

    So I'm working on this project for a inflatable solar sail (so a spherical solar sail) and we are really only verifying the deployment of the sail in space (from a cubesat)....We are doing a mock PDR and I need to find info on the sail we'll be using. My job is to find an "off the shelf"...
  7. C

    I Buoyancy calculations

    As a note, this is my first post on this site. I was looking at some bouyancy calculations with regard to balloons being in air when I came across this post. I cannot understand why the calculation for the net force of bouyancy done by Vintage (the last post on the page) does not include the...
  8. psuedoben

    Measure the volume of a lighter than air balloon

    hello, i am trying to calculate the volume of a balloon (which is quite large). It has been filled with helium via a valve connecting helium storage tanks to the balloon. The knowns I have are the volume of the storage tanks, the intital pressure in the tanks, and the final pressure in the tanks...
  9. T

    I Galileo's experiment and a lack of understanding...

    Could anyone offer me a little help with understanding why the principles demonstrated in Galileo's (probably fictional, I know) experiment involving two spheres of the same mass from a tower don't apply in the following situation please? As I understand it, the principle is essentially that...
  10. D

    I Elastic energy stored in a balloon

    Hi, I have a balloon filled with glass beads (exercise-stress ball). When I squeeze the balloon, it changes its shape. Lets assume the initial shape is a sphere with radius R0 and thickness h0 and the final shape is like a pancake (cylinder R1 + half torus R2 with thickness h1). Can you help me...
  11. morganj2003

    Is a latex balloon's maximum strain independent of thickness?

    Is latex balloon maximum strain independent of latex thickness? I have been in search of a latex balloon that is relatively small when deflated and very large when fully inflated. Standard balloons that reach the desired inflated dimensions are much larger deflated than I would like...
  12. C

    Questions about this question on Hooke's Law in Balloons

    Hi, I would like to do an experiment for my physics class about which balloon has the highest stretch ratio and found the following page on this forum: https://www.physicsforums.com/threads/hookes-law-for-a-balloon.670566/ First of all, can you please explain this function? σ=σ(λ). I'm...
  13. M

    Filling Balloons

    Homework Statement A clown at a birthday party has brought along a helium cylinder, with which he intends to fill balloons. When full, each balloon contains 0.00260 m3 of helium at an absolute pressure of 1.10 x 105 Pa. The cylinder contains helium at an absolute pressure of 1.80 x 105 Pa and...
  14. G

    Classic Static Electricity Balloon Example

    Homework Statement 1. Explain why a balloon sticks to a wall after being rubbed on your shirt (remember the wall is not metal and does not have "free" electrons") 2. Include a balanced force diagram that includes the electrical force and gravitational force (assume electrical force is twice...
  15. Y

    IGCSE Physics Boyle's law question

    Homework Statement The helium in the cylinder has a volume of 6.0 × 10^–3 m3^-1 (0.0060 m^3) and is at a pressure of 2.75 × 10^6 Pa. (i) The pressure of helium in each balloon is 1.1 × 10^5 Pa. The volume of helium in an inflated balloon is 3.0 × 10^–3 (0.0030 m3). The temperature of the...
  16. D

    Escaping earth's atmosphere with a balloon

    Hi all, So my question is, could you use a weather balloon to assist with escaping the atmosphere and attaching a rocket to take it the rest of the way, and we're talking a really small payload obviously. Would the weight of the fuel/rocket weigh down the balloon enough to significantly...
  17. AdityaDev

    Expansion of balloon

    If I heat a rubber balloon filled with helium slowly and if the balloon is fully expandable and (the balloon) can be assumed to require no energy in its expansion,what type of thermodynamic process is taking place? Is it isobaric? Since the balloon expands the pressure exerted by the gas on...
  18. C

    Balloon in Earth's atmosphere

    Homework Statement At an altitude of about 10 km, the temperature of the Earth’s atmosphere is roughly -50°C and the air pressure is around 16 kPa. (Assume ideal gas) How many kilograms of hydrogen gas (H2, molecular mass 2g/mol) should be put in a balloon to fill it to 2000 m3? What is...
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