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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. S

    Gas Block, Offset Rail & Detach/fixed Rear Sight

    1. $15 Gas Block, Used, Railed .750 dia 2. $10 45* offest rail 3. $GONE Rear sight... fixed A2 style, rail mounted. TRADE? 45acp and 357mag reloading components Unique, 748, 4064 Powder Garand Enbloc Clips Located in Vancouver, can meet in PDX some days... PM for shipping
  2. A

    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. Richardobra

    Colt m16A1 upper receiver/barrel and front sight post and gas tube

    Colt m16A1 upper receiver w/ tear drop forward assist. Colt m16A1 20"barrel 1/9 twist chrome lined Colt m16A1 front sight post w/gas tube Comes with barrel nut, us marine corps bayonet and sheath Asking $500 or trade for Glock23 w/ extra 9mm conversion and mags. Or Rock island/ kimber 1911 In...
  7. S

    WTB WA  MID Length Gas Tube

    Need a mid length tube... I can offer a new carbine tube in trade or cash..... Or if anything else I have in the classifieds is of interest..... I NEED a mid length tube Meet in Vancouver or Portland
  8. 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.
  9. 308

    0.75” Adjustable Gas Block $29.95

    JoeBob Outfitters Low Profile 0.75” Adjustable Gas Block $29.95 I ordered a couple. JBO ADJUSTABLE Low Profile Gas Block .750 Black
  10. L

    "New" Coleman Powermate 5000 gas generator (NOS)

    New old stock. I bought this about a decade ago. I've never put a drop of fuel in it. Gas tank is bone dry having never been filled. It's never been turned on, obviously. It's been stored covered under plastic in my garage. Cord is still coiled and zip tied as it was when new. Mine is the...
  11. kmk1012

    Who Makes a Decent Gas Can Anymore?

    I recently bought a new can with the “safety” style spout on it. The first time using it I promptly spilled gas all over the mower and garage. I’d like to meet the inventor and punch him in the nether regions.
  12. D

    Lack of gas?

    DPMS10/308 Built two EXACT identical weapons except one has a 16" barrel & the other has an 18" barrel. 16" version operates 100% like it should. Cycles just fine and stays open on last round. 18" refuses to cycle properly if at all. Swapped lowers, didn't help. Before the weapons were...