Re: [nbos] Atmospheres.
"Dutton, Dennis L"
Tue Jan 30th, 2007
Thanks. That's in the general direction I was asking.

I have World Builder's Handbook and most of the MegaTraveller stuff. I
haven't had a chance to look in MT but WBH has a discussion of the
effects of various chemicals (although, I'll have to look up the
chemical symbols to relate Traveller to AS). There is also an in-depth
discussion in one of the Journals of the Traveller's Aid Society (but
again with names and no symbols). I can look up the symbols but, what I
haven't seen anywhere, is a discussion on the percentages such as given
with AS and as you mentioned below.

Rather than a number of college degrees, I'm just looking for a rough
idea for reasonableness checks in a roleplaying game.

Cheers, Dennis
Game Master, Morning Garden
Play-by-Email Campaign

> -----Original Message-----
> From: Mike Oliver []
> Sent: Tuesday, January 30, 2007 7:55 AM
> To:
> Subject: Re: [nbos] Atmospheres...Was: Fine control on random
> systemgeneration?
> Wow, that's a question that you'd need degrees in
> biochemistry, physics and inorganic chemistry to determine.
> In simplified form, Earth has an Oxygen content of around
> 18%. Humans can tolerate less than this but I don't know what
> the lower limit might be. Standard air pressure is 14 pounds
> per square inch (known as 1 atmosphere) but, if you climb
> high mountains, it reduces considerably. Again, I don't know
> the human limitation and it will vary from individual to
> individual. Also, acclimatisation helps tolerance - for
> example sports carried out at great heights require the
> athletes to arrive weeks early to become used to the thinner
> atmosphere.
> I can't recall whether Traveller details more information in
> its MegaTraveller form or whether the World Builders Handbook
> has more info. I have both and will look it up for you.
> Corrosive materials are typically such gases as Chlorine
> (Cl2), Sulphur Dioxide SO2), Nitric Oxide (NO2), Hydrogen
> Chloride (HCl) - which becomes hydrochloric acid when
> dissolved in water - and a whole host of others. Indeed,
> oxygen might be considered corrosive if you think what it
> does to metals like iron. Many of these will be found in a
> "Tainted" atmosphere type as well; it's probably only the
> concentration that decides.
> When you say "noticeable", the question arises "by whom and
> how?" Some corrosive materials can be detected by smell
> before they become harmful to a human but are corrosive to
> other materials at lower concentrations than this - it tends
> to be a matter of exposure time as well.
> Finally, there are gaseous compounds that might not be
> classed as corrosive but are harmful - some organic
> (carbon-based) chemicals come into this category. Carbon
> Tetrachloride - a solvent - is corrosive to human lungs but
> not to many inorganic materials; Ether - (CH3CH2)2O - an
> old-fashioned anaesthetic, is corrosive to human lungs if
> used for a protracted time but would probably be classed as
> an "Exotic" gas in Traveller.
> That seems a bit sparse and generalised but you'll get the
> idea from what I've said, I guess. I'll come back to you on
> the MegaTraveller/WBH data as soon as I can.
> Cheers,
> Mike

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