What is the ascension rate of a gas balloon without air friction?

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Discussion Overview

The discussion revolves around the ascension rate of a gas balloon, specifically focusing on calculations made without considering air friction. Participants explore the implications of various parameters such as balloon shape, air density, and the effects of air drag on the ascent rate.

Discussion Character

  • Technical explanation, Debate/contested, Mathematical reasoning

Main Points Raised

  • One participant claims to have calculated an ascension rate of 13.49031149 m/s² for their gas balloon without air friction, providing specific measurements for the balloon's dimensions and the air density.
  • Another participant questions the clarity of the initial post, suggesting that the question is not explicitly stated.
  • A third participant references a related thread, indicating that the discussion also involves how air drag affects the balloon's rate of climb over time after release.
  • Further clarification is provided that the balloon in question is fully inflated, not partially inflated.
  • A later reply emphasizes the importance of measurement accuracy, suggesting that excessive decimal places in the calculated ascension rate may be unnecessary and that a simpler representation would suffice.

Areas of Agreement / Disagreement

Participants express differing views on the clarity of the initial question and the relevance of precision in measurements. There is no consensus on the best way to present the ascension rate or the effects of air drag.

Contextual Notes

Some assumptions regarding the balloon's shape and the conditions under which the calculations are made remain unaddressed. The discussion does not resolve how air drag quantitatively affects the ascension rate.

Imustthink
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I have calculated that my gas balloon's ascension rate is 13.49031149 m/s^2 WITHOUT air friction.

Ignore wind and let's say ground air density is 1.2 kg/m^3 at 20 °C.
The shape of the balloon will be a cylinder with rounded ends. The top end will have a 4 meter diameter so the area of that is 12.5663706 m^2. The length or height will be 14.2916666 m.
 
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Where is the question?
 
From an other thread, Imustthink wants to know how the rate of climb of his balloon is effected, from release, by including air drag. In essence, you release his inflated, or partially inflated balloon (he hasn't said which) ,and release it, how is its altitude a function of time?
 
Phrak is correct and the balloon is Inflated.
 
How do I find the ascension rate of a gas balloon when you factor in air drag?

Its inflated Not partially inflated from release.

I have calculated that my gas balloon's ascension rate is 13.49031149 m/s^2 from initial release WITHOUT air drag.

Ignore wind and let's say ground air density is 1.2 kg/m^3 at 20 °C.
The shape of the balloon will be a cylinder with rounded ends. The top end will have a 4 meter diameter so the area of that is 12.5663706 m^2. The length or height will be 14.2916666 m.
 
(two threads merged)
 
Imustthink said:
I have calculated that my gas balloon's ascension rate is 13.49031149 m/s^2 WITHOUT air friction.

Ignore wind and let's say ground air density is 1.2 kg/m^3 at 20 °C.
The shape of the balloon will be a cylinder with rounded ends. The top end will have a 4 meter diameter so the area of that is 12.5663706 m^2. The length or height will be 14.2916666 m.

Please learn some respect for measurements your post should read:

"I have calculated that my gas balloon's ascension rate is 13.5 m/s^2 WITHOUT air friction.
Ignore wind and let's say ground air density is 1.2 kg/m^3 at 20 °C.
The shape of the balloon will be a cylinder with rounded ends. The top end will have a 4 meter diameter so the area of that is 12.6 m^2. The length or height will be 14.3 m"

There is no way in the universe to measure the quantities concerned to accuracy you claim with all those useless digits. Please in future ignore all but the first 3 or 4 digits produced by your calculator, the rest are just noise and have no meaning.
 

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