Can gas density be permanently altered and what influences it?

[Kienken333]

Can the density of gas be changed for good, or is the change just temporary?
And what increases density in gases?

 

[mathman]

I don't what you have in mind by "change for good". In any case, gases can be compressed or decompressed to change density.

 

[Kienken333]

This may be a dumb question? But can a gas be harder than a solid? Like can the atoms in a gas, create bonds to make the gas incredibly strong. Thanks.

 

[jtbell]

How would such a gas be different from a solid?

 

[mathman]

In a typical gas, molecules are separate and move around freely. In a solid there is a lot of linkage.