Air springs work by using the characteristic of compressed air to resist further compression.
A strut is a structural component designed to resist longitudinal compression.
Another possibility is that the dark matter is slightly warm, giving it a pressure that resists compression.
But physicists still do not have a complete answer for why crumpled paper is strong enough to resist further compression.
Degenerate gases strongly resist further compression because the electrons cannot move to lower energy levels, which are already filled.
It is the opposite of a strut or column, which is designed to resist compression.
The resulting beam or column is effective at resisting tension and compression (buckling).
In the case of liquids and solids the molecules are almost "touching" one another so they resist further compression.
Some liquids resist compression, while others can be compressed.
Wool repels water nicely and also resists compression, but it weighs much more than any alternative.