Inert Gas System Flammability Diagram Line Slope Reason ?

Please find a simple explanation of Why Slope in Flammability Diagram
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[@G-sachinks]

But surveyors asking 1 more reason for that. What is it??

[@nandhu234]

but the oxygen conc is in x axis how is the ab line slanting and also why is ab representing oxygen

[@CLASS4ORALS]

Watch carefully.(that vertically written O2 values are corresponding to help you for HC). O2 values are always at X axis.
AB line is not representing Oxygen..it represents A,C & D are HC values corresponding to Different O2 values. Like 0%HC at 21% O2, & 10% HC at 18.9% O2.
Refer the calculation chart table.

[@CLASS4ORALS]

The corresponding values of HC AND OXYGEN are causing the Graph to look like that.
Try to plot with values yourself

[@diwaker1000]

can u tell full detail //

[@CLASS4ORALS]

I have explained it