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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 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. PappyChef

    LPG Jet for 1950s Cannon Gas grill

    Our House is now fully Heat Pumped, insulated and we have had the Gas Meter Removed. We have a 1950s foldaway Cannon Gas Grill which is on the wall above the AEG Induction hob with 1 Gas burner. It worked very well on Natural gas. We have had the local gas co. install an LPG supply using...
  2. D

    Gas smell on ideal RS 50 boiler

    Recently noticed a gas smell coming from my ideal classic RS50 boiler. Cadent have been out and confirmed a small leak and capped off the gas. The question I have though is that the gas smell only appears when the boiler fires up not when the pilot is burning normally. Gas smell continues as...
  3. J

    Can I remove a disconnected gas fire,leaving the back boiler in place?

    Hi all, I am a plumber but I do not carry out works to boilers as the majority of my is bathrooms so I am not gas safe. I have completed a bathroom for a regular customer. She is of old age and is starting to get a little clumsy and her son has asked me to look at the old gas fire/back...
  4. back2thefuture

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    Dear all, We were disconnected by our gas supplier. We have no managed to find the money to clear the bill. They have told us it will take 10 days to reconnect us. There is a vulnerable old person in the house and we have no heating or hot water. Also we are worried that the pipes will freeze...
  5. P

    Working gas pressure on Vaillant ecotec 630

    British Gas servicing the above boiler ramped up the boiler to maximum in the installer menu to do flue gas analysis. They also measured the working gas pressure on the gas valve test nipple. This fell to 8mbar on maximum and 17mbar on high setting. They then removed the isolation valve under...
  6. T

    URGENT Anyone know how to clear a f70 fault on british gas 330+ boiler

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  7. M

    Gas hob ignition issues??

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  8. mattgriff88

    Old gas pipe? Can it be removed?

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  9. M

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  10. G

    22mm Gas Feed for 35kw boiler - How do I know this is big enough?

    Hi folks, i've just moved into a property last month and begun to take note of things that may need attention. One of which is the feed to a 35kw system boiler appears to be in 22mm flexible steel pipe (tractpipe, or teslaflex or w/e). Distance from the meter is only 4m-5m or so, and I assume...
  11. abc_plumb

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  12. D

    Gas smell issue in home, need advise.

    About 10 months I started having issues with a gas like smell in my home and the gas board was unable to find any gas leak I've still got the issue. When I first made contacted enviromental health I was told the following Could be my drains and to have my drains checked. Could be the sewers...
  13. P

    Lukewarm water problem with Veissmann v 50 gas boiler

    Hi all, thanks for adding me. My Veissmann v50 combi gas boiler has recently started to supply only lukewarm water to the bathroom above it. This is about 3 metres away, so quite a short pipe run. It supplies hot water fine to the kitchen taps, which are about 1 metre away. It also supplies very...
  14. Clarky3225

    Can a gas leak detector help me?

    Hi sorry im a newbie, pls help if u can. I had a new bathroom installed about a yr ago and since then when i flush the toilet the room stinks of sewer gas. Not only does the b/room stink it also smells in the kitchen too, which is directly below the toilet/b-room. It doesnt do it everytime...
  15. R

    Connecting gas fired generator to mains gas

    I've had an idea to use a gas fired generator running on mains gas to top up a large off grid battery bank when solar power is insufficient. Can anybody tell me if this is legal in the UK? Mains gas is much cheaper than electricity per kwh and the fact I've never heard of anybody doing the same...
  16. Anonymous99

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    Hi, I'm looking for a gas engineer who I can work with so I can complete my portfolio. I have done level 2 and 3 tech cert along with bpec gas foundation and in order to progress to ACS, I have to finish my portfolio. I also want to learn plumbing along with gas so I can learn more things. I...
  17. N

    Should a new gas supply feed be included in a whole house replumb job?

    I am undergoing a whole house refurb including new plumbing, boiler, rads etc. I specifically asked for new copper pipes throughout the property which they charged extra for (didn't want push fit piping). I have now been told in the middle of the job that they recommend a replacing the...
  18. D

    URGENT Gas Boiler Leaking Yellow Water

    2 of my properties tenants have notified me that their boilers are leaking yellow water, i need someone ASAP since that Rubbish is disgusting and i cant let them live off like that. Water heating is fine tho, i am prepared to pay anything just get here asap post code is TA5
  19. K

    One burner on gas hob not working

    How would you classify this for a LL cert?
  20. T

    Sewer gas smell from shower 10am daily.

    For about a year, my shower on a third floor is giving an on off gas smell sometimes after a shower and particularly in the morning not long after the sun rises enough to hit our roof. I usually run some water into my p-trap and the smell goes away after a few minutes. There is a tub right...
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