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ppmv and the ideal gas law

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spacebee:
Hi,

I am studying for my PE exam and there is an equation in my notes that relates concentration ppmv (Cppmv) to the ideal gas law:

Cppmv/10^6 = (mass*Runiversal)/(Pressure*Volume*MW)

I understand PV=nRT and that n=mass/molecular weight, what I cannot figure out is how Cppmv and 10^6 found their way into the equation. The right side of the above equation is the gas law with all of the variables on one side, but the left side?? Please *delete me*

Please help me understand this equation.
Nastassja

Hunter2:
1. Temperature  is missing.
2. For what stands cppmv

Borek:
This is just a definition - Cppmv and 106 are there to define the Cppmv, it is not like it is some solution to some problem, one that can be derived from other equations.

mjc123:
The RHS equals nR/PV = 1/T. This is not equal to any kind of concentration.

Aldebaran:
You can in fact rearrange the gas equation to give concentration: n/v =P/RT. This will give mol/litre or cubic metre or whatever depending what units you are looking for. You could then further change the units to ppm if you want to I suppose  However I’m not entirely clear what the OP is trying to achieve.

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