>things with less density than air float
>when you suck air out of a container, you can't suck all of it out
>so there's still some in it
>gasses expand to fill their container
>but sucking the air out of something somehow crushes it instead of making it float
>when you suck air out of a container, you can't suck all of it out
>so there's still some in it
>gasses expand to fill their container
>but sucking the air out of something somehow crushes it instead of making it float
