timwinters
Ejection Handle Pulled
They may just BE a dweeb...
Guilty!
Of course the use of the word "delta" is not an all or nothing thing, as with most topics.
I would never use "delta" in casual conversation. But I certainly do use it, along with "T", when I'm talking about the temperature drop across the coil in an AC system with someone who also understands the proper terminology.
Just like I would never use "niner" in casual conversation but always do on the radio.
I do catch myself occasionally using "negative" in casual conversation though...