Proper nouns refer to specific people, places, or things. For example:

* People: John Smith, Queen Elizabeth

* Places: Paris, Mount Everest

* Things: iPhone, Great Wall of China

Physics, on the other hand, is a general term for the study of matter and energy. It's not specific to a particular person, place, or thing.

However, there are some specific instances where "physics" might be used in a way that resembles a proper noun:

* Specific physics departments or institutes: For example, "The Department of Physics at Stanford University."

* Specific theories or laws: For example, "Newtonian Physics," "Einsteinian Physics."

In these cases, "physics" is being used to refer to a specific entity or concept, but it's not a proper noun in the strict sense.