changes of state

Lets first start with temperature.It being a measurse of "kinetic
energy"(energy of motion O ya) of say gas particles.Thus gas pressure
createws heat (O ya) Canwe say "gas particles?) I have a particle
theory that tells particles in the micro realm never touch. It goes
with my photon theory that they do not bounce. This just jumped in
"Does the universe have a critical temperature? Is the universe
getting colder because of its accelerating exspansion?? Universe
is said to have been much more dense in its early spacetime(That
fits) Ooops this just jumped in "Is the universe in a "phase
transition? (like condinsation and evaporation) I am in a state of
confusion.go figure bert