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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. JD42

    WTS OR  DPMS 16in .308 mid-length gas barrel

    Hi I have a excellent take off DPMS 16in .308 chamber 1/10 twist. Barrel mid-length gas system dimpled for gas block. Std 5/8x24 threads. Less than 100rds fired chrome moly. $70 shipped PayPal gift or fee or postal money order can do a face to face in Salem
  2. titsonritz

    Understanding the AR-15 Gas System

    Here a quick primer on the AR gas system... Understanding the AR-15 Gas System
  3. 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...
  4. Richardobra

    WTS/WTT WA  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...
  5. 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
  6. S

    WTT WA  Carbine Length Gas Tube ... NEED A MID-LENGTH

    Looking to trade a new carbine length tube for a mid-length tube Meet in Vancouver/Portland area
  7. 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.
  8. 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
  9. L

    WTT WA  "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...
  10. draza

    WTS OR  MidWest Industries AK Railed Gas Tube

    Barely used, had it on my Saiga AK74. Fits most standard AK's. Rough round count with it on, 200-300 rounds. $50 No shipping No trades
  11. Pluto42

    WTS WA  Cast Bullet Gas Checks, 30 cal., 44 cal. 38 and 35

    Items spoken for. 1 Tin of 1000 44 cal. Hornady gas checks 1 almost full box of .35 cal Hornady gas checks a second box of 250, 35.cal. gas checks that is almost full. 1 box with approximately 60-75, 38 cal. gas checks 2 tubes of RCBS Bullet Lubricant #80001 1 tube Lyman Ideal Bullet Lube
  12. ConcernedCitizen

    WTS OR  Power Stroke 2200 PSI 2.0 GPM Gas Pressure Washer (NIB)

    Power Stroke 2200 PSI 2.0 GPM Gas Pressure Washer (NIB) $175 Prefer FTF near Tualatin Cabela's or Tigard Pawn. Thanks for looking! :s0090:
  13. 41mag

    WTS OR  vintage gas can collection

    I fed my saws & various lawn equipment for years with the contents of these metal gas cans. 2 1/2 gallon; no dings. May need lid gasket or spout/vent remedy. 2 Eagles, 1 Lawnboy, 1 Sears. Also fairly rare if not extinct now, a 1 1/4 gallon combo Stihl gas can with snap on lower tool tray...
  14. 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.
  15. 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...
  16. 2A2Dend

    Department of Defense Orders $250 Million of Gas Masks

    Department of Defense Orders $250 Million of Gas Masks
  17. S

    WTS/WTT WA  5gal of Kerosene, in Gas Can

    got about 5gal of kerosene here. Fresh, a few months old... Brand new gas can $20 Trade for 1911 magazines .357mag brass 30 carbine ammo or components
  18. eldbillbo

    WTS OR  BCM 16" Mid-Length gas Gov Profile barrel Stripped

    BCM 16" Mid-Length gas Gov Profile barrel Stripped low rds $125
  19. Defense Minister

    WTS OR  DPMS LR-308 16" 7.62 1:10 Twist Barrel and Carbine Gas Tube $85

    This DPMS 16" 7.62 barrel has a 1:10 twist rate, .750 gas block journal, and came off my LR-308 Oracle. It is in great shape with approximately 600 rounds through it and was changed out because I wanted a nitrided barrel with a mid-length gas system at the time. I don't own the rifle anymore...