this has to be the stupidest question but i don't care
2007-04-17 14:43:08 · 4 answers · asked by mhlad2003 2 in Science & Mathematics ➔ Physics
That depends on how big the balloons are.
If you are thinking about those party balloons, the volume of those is around 4 l. Filled with helium (4 g/mole) , but displacing air (around 29 g/mole) one gets a buoyant force able to lift about 15 g per 23 l (leaving about 1 g for the mass of the balloon itself), or roughly 2.5 g per balloon.
A adult human is around 60 kg, so you'd need 24000 balloons, but make it 25000 to 30000 just to be safe (one would need ropes and strings to attach those, and that adds to the mass).
2007-04-17 14:54:59 · answer #1 · answered by Vincent G 7 · 0⤊ 0⤋
Actually, it isn't. The result might surprise you. The "lift" from helium is about 25 g/mole of helium, the difference between helium's weight (4) and air (about 29). Lets use a pretty big balloon of 25 L, which at room temp and 1 atm holds a mole of helium. So each such balloon can lift 25 g. An adult human is about 70 kg or so, so we need 70000 g/25 g/balloon or 2800 pretty big balloons.
2007-04-17 21:54:31 · answer #2 · answered by cattbarf 7 · 1⤊ 0⤋
It would depend on the weight of the human. Ever see a clown with more than 30 balloons? Nope, because they don't want him to take flight!
2007-04-17 21:50:46 · answer #3 · answered by sutherngrlz 1 · 0⤊ 1⤋
1 million
2007-04-17 21:49:55 · answer #4 · answered by Samuel Adams 7 · 0⤊ 1⤋