Conversation started Sep 9, 2022 at 10:04.
pxeger
pxeger
Sep 9, 2022 10:04
CMC: Easiest way to measure the mass (not weight) of a helium balloon
mousetail
mousetail
Do you know the volume?
pxeger
pxeger
You can measure the volume if you like, but that counts against your "ease score"
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A: Sandbox for Proposed Challenges

Bjopfind overlap between 2 grids You have 2 grids with numbers inside, and you want to find the overlapping parts. For example The firdst grid 1 2 3 4 1 2 3 4 1 2 3 4 The second grid 2 3 4 1 2 3 4 2 9 8 6 4 This part is the overlapping part: 2 3 4 2 3 4 And when you combine, you sould get this: 1...

PyGamer0
PyGamer0
Sep 9, 2022 10:41
@pxeger turn you weighing scale upside-down and reset it to zero and put the helium balloon below it
oh wait will that work lol
pxeger
pxeger
That doesn't include the mass of the rubber in the balloon
PyGamer0
PyGamer0
:(
pxeger
pxeger
And in fact that just measures the buoyancy force; I don't know enough about physics to say if that's easily related to mass
PyGamer0
PyGamer0
buoyancy is related to weight ...
mousetail
mousetail
@PyGamer0 It's just the weight of the air you are displacing right?
pxeger
pxeger
Sep 9, 2022 10:48
Oh I should add this rule: you may not pop or deflate the balloon
PyGamer0
PyGamer0
@pxeger its the bouyant force, just use F=ma /s
mousetail
mousetail
Is the balloon filled with 100% pure helium?
pxeger
pxeger
I think that would make it too easy
Let's say it's mostly helium but also some unknown small proportion of air
emanresu A
emanresu A
@pxeger That can be measured from the packet
pxeger
pxeger
The balloon is already inflated, you can't pop it, and there aren't any more balloons in the packet
mousetail
mousetail
Sep 9, 2022 10:52
Ok, then I'd do buoyancy yes. Weigh the balloon, subtract the density of air times the volume and you got the mass
emanresu A
emanresu A
@pxeger You have the packet though, from which you know what type of balloon it is
pxeger
pxeger
There's too much batch-to-batch variance to rely on information about any other balloon
Stop side-stepping my problem!
@mousetail How do you measure the volume?
You can't really use the obvious method of water displacement because water sinks and helium floats
emanresu A
emanresu A
And? You can still shove it in
mousetail
mousetail
Why can't you hold it underwater?
emanresu A
emanresu A
or locally invert gravity
mousetail
mousetail
Sep 9, 2022 10:54
I guess weight it underwater too since the pressue would decrease the volume
pxeger
pxeger
I guess you could tie it to a heavy thing at the bottom of a tank of water, and then subtract the volume of the heavy thing and string
@mousetail That would also make it easier because the density of water is easier to find out accurately than air
emanresu A
emanresu A
My method: Get pxeger to do it.
PyGamer0
PyGamer0
My method: ignore the problem
mousetail
mousetail
My method: Guess 7 since it's always the correct answre
emanresu A
emanresu A
My other method: Get a volume integral wrong and come up with a negative mass. Then, open wormholes.
 
Conversation ended Sep 9, 2022 at 11:02.