So physics and chemistry are less content with specious reasoning (9)
I believe the answer is:
sophistry
'specious reasoning' is the definition.
(thesaurus)
'so physics and chemistry are less content' is the wordplay.
I cannot really understand how this works, but
'so' is found in the answer.
'content' could be 'hi' (hi is a kind of content) and 'hi' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'with' acts as a link.
Can you help me to learn more?
(Other definitions for sophistry that I've seen before include "using misleading arguments" , "Made-up arguments" , "tortured reasoning" , "Deceitful use of fallacious arguments" , "Subtle but misleading reasoning" .)