Mixing gases to achieve desired ppm

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To achieve a constant flow of mixed gases with specific ppm levels of hydrogen (H2) in nitrogen (N2), it's essential to understand that ppm typically refers to parts per million by volume in this context. For a 2-liter container, the desired concentration can be calculated by determining the volume of H2 needed for each ppm level. Without mass flow controllers, filling the container from vacuum requires calculating the pressure of nitrogen first, followed by the pressure of hydrogen, ensuring that the final mixture meets the desired ppm. The calculations must consider the ideal gas law to determine the appropriate pressures for both gases to achieve the target concentration. Accurate measurements and adjustments are crucial for maintaining the desired gas mixture.
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I have to mix 2 gases, Hydrogen and Nitrogen to achieve a constant flow of mixed gas with 100, 200... 1000 ppm of H2 in the mixture.

I have mass flow meters to adjust the flow of each individual gas but how do I determine what they should read to achieve the desired ppm
 
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Parts per million of what? Mass? Volume? Molecule count?
 
ppm of volume in the container... sorry for being vague. the container has a volume of 2l.

Also, without using the mass flow controllers, if i were to just fill in the container with hydrogen and nitrogen starting from vacuum, what should be the pressure to which i should fill up nitrogen and then add hydrogen to get the desired ppm
 

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