I have refer based on two articles there are two equation on how to calculate the vapor concentration Cg (ppm) inside the chamber :
1) C (ppm) = C x V x d x R x T x 10
Po x Vc x M
2) C (ppm) = V x d x R x T x 10^6
Po x Vc x M
Where:
C: Concentration of liquid analyte (wt%)
V: volume of liquid injected (ul)
R: universal gas constant (L atmK−1 mol−1)
T: absolute temperature (K)
M: molecular weight (g/mol)
Po: chamber pressure (atm)
Vc: volume of chamber (L)
d: density (g/ml)
My question is what does the x10 and x10^6 represent? Why there have two different value there?
Thanks
Maybe you should consider the dimensional analysis, that is, the units of the variables you use. It could be that 10 stands for mg/m^3 and ^6 for ppm, as in similar calculations, but in general it depends on your units of measurement (that are not provided in the question).
Hope this will lead you to something.
the 10+6 might be due to the ratio between 1 and million.
Also the IS units made ppm as an out of use unit. The IS units are w/v eg. µg/ml or w/w eg. µg/g or v/v eg. ml/l
Hello Nur Zuraihan... I am also working on sensor application.
Can you please give me the references of the equations you have asked. It will be a great help.
Sibani Majumdar Hi Sibani, here the article title : High sensing response of β-Ga2O3 thin film towards ammonia vapours: Influencing factors at room temperature. I attach here the article, you can download it
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