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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, such as air, contains a variety of pure gases. 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.
The gaseous state of matter occurs 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 very low temperatures are classified by their statistical behavior as either Bose gases or Fermi gases. For a comprehensive listing of these exotic states of matter see list of states of matter.

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  1. Bbarclays

    Is this an old gas pipe? Pic attached

    Hi there Removed old fireplace on 1950 built bungalow, found under floor pipesx2 joint together. One pipe coming to kitchen and dissapiering under bricks, another coming towards hall. Diameter of pipes 22mm and it is steel attached. Gas pipe to meter coming from underground...
  2. O

    Is it safe to make recording studio in room with water and gas metre?

    Hi everyone, I would like to put foam acoustic panels all over the walls and ceiling of a room to soundproof it, here are the panels:
  3. CorgiDirect

    20% OFF TPI DC710 FLUE GAS ANALYSERS. Offer valid until 30/05/20

    VIEW HERE DC710 WAS £295 NOW £236 DC710C1 WAS £350 NOW £280 DC710C2 WAS £425 NOW £340
  4. J

    NG Gas grill connection

    I know very little about plumbing, so I'm not even sure what to ask for and I may use the wrong descriptions of items, so apologies if so. I've done some searching online, but not entirely sure what I need to get. I recently moved into a house that has a gas outlet on the deck. I bought a...
  5. CorgiDirect

    Free Wera multitool worth over £45 (RRP) with selected Testo flue gas analyser kits

    We have launched a fantastic new offer across TESTO's most popular flue gas analyser ranges. For a limited time only, We are offering a Free Wera multitool worth over £45 (RRP) with selected flue gas analyser kits! Don’t miss out on this one-time offer This outstanding offer is available on...
  6. B

    Gas supply and automatic interior switc

    Gas heating is set to come on 2hours per day via interior automatic switch. I would like a neighbour to go and turn gas supply off at mains as she has no key. I am away. Is this safe? but i but I want a neighbour to
  7. M

    Boiler fault. Gas valve ?

    Evening all, I am the unfortunate owner of a very large gravity fed floor standing gas boiler. A few days ago the boiler decided not to come on when there was demand. The pilot light remained on. After a quick look over and attempted relighting the pilot light went out and would never stay...
  8. Y

    LPG Flexi installation concerns!

    In december I had a gas safe registered company carry our an inspection on my food trailer with a view to obtaining a Gas Safety Cert. The engineer informed me that the small bore pipe to my two fryers was not sufficient for the appliances, and that he would also need to fit flexi pipes to the...
  9. PlumbingNoob

    Smelly Odour Randomly Started

    I have had a mystery smell start in my house all of a sudden. The smell is prominent in an adjoining linen closet to my bathroom and appears to e coming from subfloor. My home sits on brick piers (single story) with a dirt subfloor and forced fan subfloor ventilation installed to keep it all...
  10. L

    Gas line for dryer failed inspection

    Gas line for dryer coming out of wall about 3" and runs about 2' along wall then elbows along furnace. Inspector failed and wants specs on stack washer/dryer. Will not return calls, not sure what to do. We took out water lines and vent - no washer/dryer for that room.
  11. J

    Advice? Gas supply valve and meter newly enclosed after house extension. Is this risky?

    Hi, wondering if anyone can offer some advice? We just had an extension in the light-well house (lower ground floor), installing a glass roof to the light-well. This is where our gas and electric meters are, as well as the main supply valve. My concern is that this area used to be open and well...
  12. J

    Advice? Gas meter and main supply valve newly enclosed after house extension.

    Hi, wondering if anyone can offer some advice? We just had an extension in the light-well house (lower ground floor), installing a glass roof to the light-well. This is where our gas and electric meters are, as well as the main supply valve. My concern is that this area used to be open and well...
  13. S

    Tightness testing on gas installations

    Hello. First of all I’m new to this site. I’m in the process of doing my apprenticeship, but now with the current circumstances we are not working. I have a couple of basic questions which no doubt will raise eyebrows, but every body starts somewhere. In tightness testing. Regarding permissible...
  14. A

    My new gas range won't slide all the way in. Can I remove the 90 degree elbow?

    Hey guys. Looking for some advice on the best way to make my new range slide all the way in. Currently, the pipe and gas connector sticks out 6" from the wall. The range has a 4" deep recess. So I have to reduce the stick-out by 2". I was thinking about just removing the 90 degree elbow (circled...
  15. D

    Gas grill hose connection

    Hello, I am hoping you can help me. I need to connect an outdoor NG grill to an existing outside NG supply connection. I need to get the right hose to attach to my grill. A few background facts: -My Grill requires 124000 BTUH Total gas consumption with all burners set to HI -My Grill...
  16. B

    Hi. Brian S, 51, gas safe, oftec registered, electrician

    Hi, Brian S, 51 gas safe, Oftec registered electrician.
  17. P

    High gas usage bill?

    Hi - hope someone can give some advice! Have had a vaillant ecotec 630 installed with unvented cylinder, mains pressurised supply with digital thermostat in the living room. It is a 5 bed, 3 bath house. The dual fuel bill for 2 months was £600, 545kWH per month for the electricity and 4,640kWH...
  18. N

    Is my Gas installation at home domestic or commercial?

    I had a problem with my Gas boiler and called an engineer out from a local Crondall, Surrey UK company. The engineer felt my installation was commercial even though past engineers over 13 years have never said anything like this. My installation is different as I have 2 x worcester bosch 30cdi...
  19. P

    Honeywell gas valve shutting off

    Type4600 valve shuts a minute or so after burners ignite. Have tested two thermocouples (existing one and a replacement) and getting 25 mV from each. Is there any additional diagnostic I should consider before sinking cash into new valve?
  20. D

    Gas safe experience Nottinghamshire

    Hi I am working towards completing my gas safe training. I am looking to work along side someone in the field in order to gain experience and to complete the necessary portfolio. I have some experience and am willing to graft. Some compensation can be offered on completion of the portfolio. I’m...

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