Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > sci.physics > #693057

Re:Partial pressure of O2, CO2, etc., in Thailand cave

Show all headers | View raw

cornelius@eisner.decus.org (George Cornelius) Wrote in message:
>.
> 

> I am here ignoring the partial pressure of CO2. Of course it
> will  be going up as O2 is consumed by the humans in the cavity,
> but since some of the waste product of energy production in the
> body is H2O, there should be a smaller volume of CO2 produced
> than O2 consumed, say, roughly, 2:1.
> 
The major metabolic source of energy - oxidation of glucose - has
 the total chemical reaction as
C6H12O6(glucose) + 6 O2 --> 
6 H2O + 6 CO2., Therefore 1:1

For fat, it can be  simplified by ommiting the minor glycerol
 ester part as just
2 (CH2)n + 3n O2 --> 2n CO2 + 2n H2O, 
so 3:2.

Large portion of CO2 will be dissolving in water, some small part
 of it dissolving the limestone
CO2 + H2O + CaCO3 --> Ca(HCO3)2

The relative  humidity will be close to 100%, absolute  humidity
 in g/me will be near constant as well as temperature. Excessive
 water vapour  will eventually condense.

The eventual pressure decrease due decrease of total amount of
 gasses will be mostly eliminated by sucking air via limestone 
 porosity  and sucking water to decrease volume and increase
 pressure. These effects lead to both absolute and partial
 pressure increase of air gasses but CO2, which partial pressure
 increase will be much smaller.

1 % of CO2 reportedly start causing breathing problem, as
 increased CO level on blood trigger response of hypothalamus  to
 intensify breathing to get rid of it .
10 % has already an anaesthetic effect. ( Quotes Q&A source )

The questing remains, what was the initial  oxygen concentration
 before flooding. Even if the internal  space was directly
 connected to open air, the cave system  is long enough to differ
 from average air concentration. E.g oxygen can be spent by
 oxidation of iron and manganese minerals and by cave life
 forms.

-- 
Libor Striz aka Poutnik ( a pilgrim/wanderer/wayfarer)

"Humour is the only effective weapon against stupidity."
Miloš Forman


----Android NewsGroup Reader----
http://usenet.sinaapp.com/

Back to sci.physics | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Partial pressure of O2, CO2, etc., in Thailand cave cornelius@eisner.decus.org (George Cornelius) - 2018-07-07 20:55 -0400
  Re: Partial pressure of O2, CO2, etc., in Thailand cave cornelius@eisner.decus.org (George Cornelius) - 2018-07-07 21:30 -0400
  Re: Partial pressure of O2, CO2, etc., in Thailand cave cornelius@eisner.decus.org (George Cornelius) - 2018-07-07 22:19 -0400
  Re:Partial pressure of O2, CO2, etc., in Thailand cave Libor Striz <poutnik4REMOVEnntp@CAPITALSgmail.com> - 2018-07-08 06:11 +0200
    Re: Re:Partial pressure of O2, CO2, etc., in Thailand cave cornelius@eisner.decus.org (George Cornelius) - 2018-07-08 01:14 -0400
      Re: Re:Partial pressure of O2, CO2, etc., in Thailand cave Libor Striz <poutnik4REMOVEnntp@CAPITALSgmail.com> - 2018-07-08 07:30 +0200
        Re: Re:Partial pressure of O2, CO2, etc., in Thailand cave cornelius@eisner.decus.org (George Cornelius) - 2018-07-09 02:40 -0400

csiph-web