this post was submitted on 07 Dec 2025
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Their goods just got a whole lot less appealing (feddit.uk)
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[โ€“] somewhiteguy@reddthat.com -2 points 2 weeks ago* (last edited 2 weeks ago) (3 children)

A minimum of 2 fully fluorinated carbon atoms instead of 1 is NOT broadening the definition. Thatโ€™s narrowing it.

Think of the definition as a sluice gate. When you allow more things through, you're opening it wider, therefore broadening the definition. I know it's counter-intuitive sometimes to think of it like that. Narrowing the definition would be to let fewer things through, thus closing the gate.

Edit: Reading through the discourse below, I think I see the points made. It might should be reversed.

[โ€“] Leavingoldhabits@lemmy.world 3 points 2 weeks ago

But wouldnโ€™t requireing two fluoridated carbon atoms instead of just one to qualify as PFAS, encompass less chemicals, thus narrowing the definition?

[โ€“] goldfndr@lemmy.ml 3 points 2 weeks ago

Allowing more things through, if I understand your analogy correctly in this case, is broadening the exceptions -- things not matched by the definition.

But, I'll bite, let's dive in. In a Venn diagram, substances with a minimum of 2 fully fluorinated carbon atoms is a subset of substances with a minimum of 1fully fluorinated carbon atoms, yes? Similarly, M&Ms with only red and green colors is a subset of M&Ms of any color, yes? If a person was to change their personal definition of acceptable M&Ms from any color to only red and/or green, would you call that broadening that definition?

[โ€“] Limonene@lemmy.world 1 points 2 weeks ago

The EPA definition would exclude chemicals like trifluoroethanol, so the EPA's definition is narrower, not broader.

From a strict organic chemistry perspective, trifluoroethanol contains a perfluorinated methyl group, and methyl is a type of alkyl, therefore it must be considered a PerFluoro Alkyl Substance.