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Gas is one of the four fundamental states of matter (the others being solid, liquid, and plasma). A pure gas may be made up of individual atoms (e.g. a noble gas like neon), elemental molecules made from one type of atom (e.g. oxygen), or compound molecules made from a variety of atoms (e.g. carbon dioxide). A gas mixture would contain a variety of pure gases much like the air. What distinguishes a gas from liquids and solids is the vast separation of the individual gas particles. This separation usually makes a colorless gas invisible to the human observer. The interaction of gas particles in the presence of electric and gravitational fields are considered negligible as indicated by the constant velocity vectors in the image. One type of commonly known gas is steam.
The gaseous state of matter is found between the liquid and plasma states, the latter of which provides the upper temperature boundary for gases. Bounding the lower end of the temperature scale lie degenerative quantum gases which are gaining increasing attention. High-density atomic gases super cooled to incredibly low temperatures are classified by their statistical behavior as either a Bose gas or a Fermi gas. For a comprehensive listing of these exotic states of matter see list of states of matter.

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  1. Roymil666

    Build Thread  Gas issues on a new build

    So over the past few years I've built around a dozen black guns with pretty good success. But a current build has me scratching my head. The issue I'm having is failure to feed. Will eject a round but not cycle a new one. Tried multiple mags and 55 and 62gr. Running a BA Performance Series 16"...
  2. arakboss

    What is the non gas related function of the gas key on a bcg in AR, can I remove a portion of it for use in a manual loading rifle?

    Could I remove the part of the gas key that would normally slip over the gas tube (see photo) and retain the non gas related function of the gas key? I would be removing the portion of gas key covered by the green tape.
  3. 2A-Jay

    Washington gas tax change faces vote

    Washington State considering Changing Gas Tax to a Miles Driven Tax (Road Use Tax based on how many miles you have driven)...
  4. titsonritz

    Understanding the AR-15 Gas System

    Here a quick primer on the AR gas system... Understanding the AR-15 Gas System
  5. R

    Blown gas rings on M4s

    We've been out training for 2 weeks we're on our third week. We've noticed that some of our m4s have been having issues. Cleaning our M4s we noticed that gas rings are missing from the bolts of the M4s that are having issues. These are brand new M4A1s made by FN. We had beat up Colt M4s before...
  6. Tony617

    Quick question on the AK-47 gas piston

    I have question on the AK-47 gas piston. With my M14 you keep the gas piston and cylinder dry. Is it the same for AK-47 to keep it dry as well? What about the gas cylinder too? Just using CLP to cleaning and lubing right now. Thank you.
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