A Canister of Helium Question

[Glassman]

Will it get heavier as it's emptied?

[2 sMoKiN bArReLs]

No, cos it get' replaced with nothing, which weighs less.

(unless you are on Saturn)

[anonymous-user]

Erm....! seriously, dont know, probably not!

[BlackVanGirl]

Glassman said:

Will it get heavier as it's emptied?

...

Liquid helium? Probably denser than sea-level air, m'guessing.

[thinfourth2]

No it will get lighter as the compressed helium escapes leaving less helium inside until you get atmospheric pressure helium inside

But if you lave the outlet open then this helium will also eventually come out and will be replaced by air at which point it will become a little bit heavier

[driverrob]

It will weigh less as venting helium will just vent helium above atmospheric pressure until the contents are at atmospheric pressure. It's not replaced by anything.