02 Oct '11 23:34

So I have played with helium balloons and found a critical weight to dangle underneath so the balloon floats at one height above ground, say 2 meters in the air and stays pretty much at that height, drifting with air movements but more or less balanced in midair.

So you have a balloon that weighs 2 grams and can be blown up to 20 cm in diameter.

So without hanging weights on the balloon to keep it at one altitude, what would be the ratio of He to say Nitrogen, some mixture would do the job just as well as adding weights but how much of He and Nitrogen?

So you have a balloon that weighs 2 grams and can be blown up to 20 cm in diameter.

So without hanging weights on the balloon to keep it at one altitude, what would be the ratio of He to say Nitrogen, some mixture would do the job just as well as adding weights but how much of He and Nitrogen?