[fds-smv] mol/mol to ppm conversion

[Gary Chen of GHL Consultants Ltd]

Hi
Can someone please help me confirm that to convert from mol fraction
to ppm we simply multiply the result produced by FDS 5 by 10^6...

z mol of gas /mol of air = y 10^-6 micro mol of gas / mol of air
y = z 10^6

Thanks
Gary

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[S.Desanghere]

Hi Gary,

ppm means "parts per million" so 1 ppm is equivalent to 10^-6. It is a
more convenient way to express very small amounts.

1 ppm CO is equivalent to 10^-6 = 0.000001 mol/mol CO

So, to convert from mol/mol to ppm, you have to multiply the result by
10^6.

Cheers
Sylvain


On 26 avr, 19:29, Gary Chen of GHL Consultants Ltd

[Karem]

Hello, 

Kindly, what is the minimum standard for CO monoxide (in ppm) for the evacuation safety of personnel?

Thank you, 

Imad

[fde]

That is defined in multiple ways. Some references give a definite limit, meanwhile others time dependent. It is also possible to calculate it via Fractional Effective Dose method. 

One example, See Section B.2.2

https://www.nfpa.org/codes-and-standards/all-codes-and-standards/list-of-codes-and-standards/detail?code=502