Why is fluorine a oxidising agent? No reason was giving for closing the question, to me the questions seems quite clear. And also in the future I request the mods to provide appropriate reason for closing questions.

I've found two methods to convert from $ppm$ to $g/m^3$. They both appear to give equivalent results, but I don't understand why. Can anyone join the dots for me and explain why they are equivalent methods, or show a derivation for Method 1? I've found a derivation for Method 2. Method 1 - Defini...