`Article Rewrite == Hi! I am currently re-writing this article so it makes more sense and is more ``wikified``. I am doing this as a 10-step process. while I complete this, please leave comments on this page until I'm done. Thanks!     STEP 1: Definition  > COMPLETE STEP 2: Characteristics  > COMPLETE STEP 3: Macroscopic Properties > COMPLETE STEP 4: Microscopic Properties > NEEDS EXPANSION - Its currently ``Stub-like`` STEP 5: ``Gas Models`` > COMPLETE STEP 6: Special Topics > NEEDS EXPANSION - Its currently ``Stub-like`` STEP 7: History > COMPLETE STEP 8: References > COMPLETE STEP 9: Clean-up > COMPLETE STEP 10: Review > (THIS IS FOR OTHER WIKIPEDIANS TO DO!)  == `