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Topic : A Physics Question

hillbilly
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27/01/2016 : 19:18:31      reply with quote


If you have a cylinder of helium and you use its entire content to fill a large balloon you could expect the balloon to float away with the ability to carry the cylinder, Why then dosen't the cylinder that the helium came in float away too ???
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Happysnapper
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27/01/2016 : 19:27:07      reply with quote


that's easy. Once you have filled the ballon the cylinder is empty so it's lighter. Oh hang on..!!!!....my head hurts
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randa
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27/01/2016 : 19:36:33      reply with quote


Mass of helium + cylinder is greater than the mass of air it displaces, despite the helium being very light,so it just sits there doing not a lot. Mass of Balloon + helium is much lighter than the air it displaces, so it toddles off sharpish in an upward direction. Mass of cylinder + remaining helium / air is still greater than the air it displaces, so it continues to sit there doing nothing. You can substitute Weight for Mass - no practical difference but less scientific.
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gazzer
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27/01/2016 : 20:24:46      reply with quote


Is helium in the cylinder Liquid which is heavier than air?
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greengrass
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27/01/2016 : 21:23:55      reply with quote


Maybe turn the tap on the cylinder then light it with a lighter to test if the cylinder floats.
Doggy have you got a light boy
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dogcatcher
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27/01/2016 : 22:03:25      reply with quote


same applies to me after a large bowl of hillbillys roadkill stew,when i have terrible wind i can blow a balloon up and float away, but stay on the ground full of it laugh :Dlaugh :Dlaugh :Dlaugh :Dlaugh :D
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dogcatcher
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27/01/2016 : 22:04:48      reply with quote


quote
posted by greengrass
Maybe turn the tap on the cylinder then light it with a lighter to test if the cylinder floats.
Doggy have you got a light boy
no but am a lighter boy, first stone in weight lost nowlaugh :Dlaugh :D
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hillbilly
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27/01/2016 : 22:08:32      reply with quote


this post has been edited 1 time(s)

quote
posted by greengrass
Maybe turn the tap on the cylinder then light it with a lighter to test if the cylinder floats.
Doggy have you got a light boy
Hey greengrass they call me Billy not silly!!! and i am not up for a trip to the space station tonight!!!
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grandad
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28/01/2016 : 11:54:50      reply with quote


I would suggest that if any gas is allowed to fill a larger volume it is the less dense and therefore lighter, i.e. hot air balloons rise because the hot air inside them is lighter than the colder air outside so the rise.
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greengrass
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28/01/2016 : 16:29:33      reply with quote


quote
posted by dogcatcher
quote
posted by greengrass
Maybe turn the tap on the cylinder then light it with a lighter to test if the cylinder floats.
Doggy have you got a light boy
no but am a lighter boy, first stone in weight lost nowlaugh :Dlaugh :D
Well done doggy just another 20 to go
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randa
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28/01/2016 : 17:17:24      reply with quote


It is compressed helium gas, not liquid, in the cylinder (helium boils at -269 deg C!). You can wave a lighter at it as much as you like - it doesn't burn. That's why it replaced hydrogen (which makes very loud bangs) in balloons.
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