Balloon Question
- Thread starter KK
- Start date
- Nov 27, 1999
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SpunkyJones
Diamond Member
- Apr 1, 2004
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- Nov 27, 1999
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Contrary to belief, a helium-filled balloon does have mass...
I can't believe some people, they think that if you fill a tank with helium it'll get lighter.
I can't believe some people, they think that if you fill a tank with helium it'll get lighter.
SpunkyJones
Diamond Member
- Apr 1, 2004
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- Nov 27, 1999
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Jeff7
Lifer
- Jan 4, 2001
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Backwards.
Imagine a tank in the car, nearly full of water, with a boat floating on top. Hit the brakes. The water would slosh forward, encouraging the boat to move backward.
In this case, I think the mass of the balloon would be negligible, given that the entire thing is buoyant.
If the tank was previously filled with air at 1 atm, and that air was replaced with helium at 1 atm, I would expect it to be lighter. Now if the tank were completely evacuated before, and then filled with helium, then it would be heavier. Similarly, if the helium were pressurized (most likely), this would introduce much more total mass, and would also increase its density. Result: more weight, and no chance of buoyancy.
Imagine a tank in the car, nearly full of water, with a boat floating on top. Hit the brakes. The water would slosh forward, encouraging the boat to move backward.
In this case, I think the mass of the balloon would be negligible, given that the entire thing is buoyant.
Was the tank filled with air previously, or with a vacuum? To what pressure is the tank filled?
If the tank was previously filled with air at 1 atm, and that air was replaced with helium at 1 atm, I would expect it to be lighter. Now if the tank were completely evacuated before, and then filled with helium, then it would be heavier. Similarly, if the helium were pressurized (most likely), this would introduce much more total mass, and would also increase its density. Result: more weight, and no chance of buoyancy.
GodlessAstronomer
Lifer
- Oct 27, 2007
- 17,009
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Forward or backward relative to what? If it's relative to the vehicle, forward. The balloon has mass and therefore inertia.
The balloon will move toward the rear of the car.
The air molecules will continue forward causing a pressure drop in the rear of the car.
The balloon will move into the lowest pressure area.
And I clicked forward by mistake on the poll
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