Search the forum,

gas pressure

In a mixture of gases, each constituent gas has a partial pressure which is the notional pressure of that constituent gas if it alone occupied the entire volume of the original mixture at the same temperature. The total pressure of an ideal gas mixture is the sum of the partial pressures of the gases in the mixture (Dalton's Law).
The partial pressure of a gas is a measure of thermodynamic activity of the gas's molecules. Gases dissolve, diffuse, and react according to their partial pressures, and not according to their concentrations in gas mixtures or liquids. This general property of gases is also true in chemical reactions of gases in biology. For example, the necessary amount of oxygen for human respiration, and the amount that is toxic, is set by the partial pressure of oxygen alone. This is true across a very wide range of different concentrations of oxygen present in various inhaled breathing gases or dissolved in blood; consequently, mixture ratios, like that of breathable 20% oxygen and 80% helium, are determined by volume instead of by weight or mass. Furthermore, the partial pressures of oxygen and carbon dioxide are important parameters in tests of arterial blood gases, but can also be measured in, for example, cerebrospinal fluid.

View More On Wikipedia.org
Recent contents Top users
  1. G

    reading gas pressure

    Can someone clarify few bits bobs for me . As far as i am aware you allowed a pressure reading of plus or minus 1 from meter to appliance say boiler .If on my u gauge i get a reading of of more than this say a drop of 3 mbar to appliance from meter , would that indicate a blockage in gas pipe or...
  2. D

    Significant drop in gas pressure between meter and boiler

    Hi guys, I had a Worcester bosch engineer out yesterday to look at my boiler, its been giving me some gip. Turns out I need to replace CH pump, however during the work guy did a gas pressure test and said it was too low. Now my boiler cover plan from Worcester bosch is invalidated until I get...
    • donkeeboy
    • Thread
    • amount between boiler drop elbows gas gas pressure meter oil pressure
    • Replies: 32
    • Forum: Plumbing Jobs | The Job-board
  3. M

    Low burner inlet gas pressure to ch boiler

    A colleague has an older atmospheric burner fired gas boiler which although working fine is near the end of its life. The problem is that the meter is 400 metres away down a long drive, piped in 2" steel to the house. Although there is 23mbar at the meter outlet, the appliance inlet pressure...
  4. S

    Gas pressure?

    Im sure someone may have already asked this on here somewhere or if not it may be me being really simple but does anyone have an answer as to why we only have a maximum of 21 mbar regulated at the meter. :confused: the reason why i ask is a national grid guy came out to a job i was on today...
  5. J

    Saunier Duval 30c swithces on and off repeatedly

    My boiler switches on and off throughout the night, literally every 10 seconds or so .It keeps the rads hot though,is this normal.I don't use the clock at all,controlling it by the room thermostat ,keeping it on maximum.
    • joetheghost
    • Thread
    • bath blockage boiler central heating system circulation drain filter fitting gas gas pressure hot parts pressure problem pump saunier system testing work
    • Replies: 9
    • Forum: Plumbing Jobs | The Job-board
  6. B

    Gas pressure

    Would the gas transporter come out if i was getting working pressure at meter of 18mb if i rung them?
    • bikerbas
    • Thread
    • boiler gas gas pressure gas safe lead pressure safe working pressure
    • Replies: 11
    • Forum: Plumbing Jobs | The Job-board
  7. S

    Issue with inlet gas pressure on multifunction valve giving false reading

    Interested to know if anyone else has had experiance of this. First time I noticed it was on a 60Kw floor standing air heater. We did the entire installation including the gas line from the meter to the unit. On commision gas reading showed a drop accross the gas line of about 4mBar. Then the...
    • standard8
    • Thread
    • air boilers gas gas pipe gas pressure giving heater inlet installation issue pipe pressure reading supply test valve
    • Replies: 2
    • Forum: Plumbing Jobs | The Job-board
  8. R

    Ideal mini c, pcb or gas pressure?

    evening all, just looked at a ideal mini c boiler which was fitted about six years ago, since then has broken down on a few accasions, most recently over last few weeks, over this period the user has kept pressing the reset button to sort out and the boiler did restart everytime, on this...
    • reggie09
    • Thread
    • air boiler button flame gas gas pressure ideal job manual mini pcb power pressure replacement reset switch valve valves wall work
    • Replies: 10
    • Forum: Plumbing Jobs | The Job-board
Creating content since 2001. Untold Media.

Newest Plumbing Threads

Tilers Forum
Electrical Advice | Electricians Blog
UK Tiling Forum
Tiling Forum
Contractor Advice Forum
Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock