There is no energy dissipation per se.

But once we start talking about gas and dissipation we have to put hydrodynamics, energy dissipation processess, radiation losses, feedback and so on.

But we can also store energy using superconductors, because we have no dissipation.

However, inside a superconductor there are no collisions, so there is no energy dissipation.

Being now free from all restraint, his life was one of idleness and dissipation.

Essentially, gas clouds keep colliding, that will inevitably cause some shock heating and energy dissipation.

To the extent that we look at gravitational interaction alone this is a dissipation less fluid.

Optimizations are great they make the programs simpler and conserve some important resource like time or power or heat dissipation.

And galaxies form largely through dissipate processes where as large scale structure is formed dissipation less leak, purely through gravitational collapse and assembly.

To quantify this, we will introduce the concept of the cooling time, and that's simply the energy that needs to be dissipated divided by the energy dissipation rate.