暖気

1. Origins, structure, and basic meaning

• Structure: Spelling: 暖気. Reading: だんき. Core meaning: warm air.
• Basic usage: Representative examples: 暖房をつけると暖気が部屋全体に広がった / 暖気は天井付近にたまりやすい.

2. Common pitfalls and similar expressions

• Air versus heater
  • 暖気 is a mass of air warmed by heating and can be described as collecting near the ceiling. It does not mean the heating appliance that produces the warmth.