Question

what do you think it means that montag considers the room \empty\ but mildred, his wife, is definitely inside?

Explanation:

In "Fahrenheit 451", Montag's home feels "empty" physically but Mildred's presence is superficial. She's emotionally vacant, absorbed in technology (like the parlor walls), lacking real connection. Montag sees her as present but empty of depth, love, or meaningful interaction—her existence is hollow, making the home feel empty despite her being there.

Answer:

It means the home lacks emotional depth/connection. Mildred is physically present but emotionally vacant (absorbed in technology, distant), so the "empty" home has her but no real warmth, intimacy, or meaningful relationship, highlighting their shallow bond.