It's the smallest monatomic gas, so it can wriggle through even the tiniest of holes.
Normally you'd liquify a gas to store it, but helium doesn't liquify until you crank it down to 4°K, which is really, really cold. Liquid oxygen and nitrogen have significantly higher boiling points.
Now if you do liquify it, the real fun is it's a superfluid so it's going to crawl all over the inside of the container, it won't just stay at the bottom.
So if you don't keep it at 4°K, or -270°C, it's going to boil, and if it boils it's a gas, and if it's a gas it's going to find any opening to squeeze out of.
>Now if you do liquify it, the real fun is it's a superfluid so it's going to crawl all over the inside of the container, it won't just stay at the bottom.
Not true. LHe’s boiling point (at atmospheric pressure) is 4.2K. The lambda point when it becomes a superfluid is 2.2K. So there’s a decent temperature range when it behaves as a normal liquid.
Normally you'd liquify a gas to store it, but helium doesn't liquify until you crank it down to 4°K, which is really, really cold. Liquid oxygen and nitrogen have significantly higher boiling points.
Now if you do liquify it, the real fun is it's a superfluid so it's going to crawl all over the inside of the container, it won't just stay at the bottom.
So if you don't keep it at 4°K, or -270°C, it's going to boil, and if it boils it's a gas, and if it's a gas it's going to find any opening to squeeze out of.